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1
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Single-Crystal Growth of f-Electron Intermetallics in a Tetra-Arc Czochralski Furnace

100%
Szlawska M., Kaczorowski D.
Acta Physica Polonica A
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2013
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vol. 124
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issue 2
336-339
EN
The Czochralski technique has induced technological revolution in the electronic industry. It has also been widely used in the fundamental research area, as it allows obtaining high-quality single crystals of large variety of binary, ternary and multinary compounds. The unique tetra-arc Czochralski furnace installed at the Institute of Low Temperature and Structure Research, Polish Academy of Sciences in Wrocław, described in detail in the article, has been used to prepare a large number of single crystals of various Ce- and U-based intermetallic phases. Their excellent quality has facilitated advanced investigations of their anisotropic, often highly unusual physical properties.
2
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Low-Temperature Physical Properties of Single-Crystalline EuCoGe₃ and EuRhGe₃

100%
Bednarchuk O., Kaczorowski D.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
418-420
EN
Since a few years europium-based intermetallics have been attracting more and more attention due to their intriguing physical properties with anomalous behaviours in magnetically ordered states. Here, we report on the formation and the bulk physical properties of two tetragonal compounds EuCoGe₃ and EuRhGe₃, studied on high-quality single-crystalline specimens. In both materials, the Eu ions are in their divalent state, which gives rise to an antiferromagnetic ordering below T_{N} = 15.4 K and T_{N} = 11.3 K, respectively. In addition, EuCoGe₃ exhibits a successive antiferromagnetic phase transition at T₂ = 13.4 K. Based on some characteristic features in the temperature variations of the magnetic susceptibility, specific heat and electrical resistivity, we suggest that in both germanides an amplitude modulated magnetic structure develops below the respective T_{N}, with the Eu magnetic moments directed along the crystallographic [001] axis in EuCoGe₃ and perpendicular to this direction in EuRhGe₃.
3
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Magnetic and Related Properties of Ternary TmTX Intermetallics

100%
Kaczorowski D., Szytuła A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
620-622
EN
We report on the magnetic and thermal properties of a few TmTX compounds, where T = d-electron metal and X = p-electron element. In all these ternaries but TmRuGe the thulium magnetic moments order antiferro- or ferromagnetically at low temperatures. The specific heat data confirms the magnetic orderings and reveals the influence of crystalline electric field effects.
4
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Superconductivity in ThIr₂Si₂

100%
Domieracki K., Kaczorowski D.
Acta Physica Polonica A
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2016
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vol. 130
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issue 2
593-596
EN
The compound ThIr₂Si₂ crystallizes with a tetragonal crystal structure of the CaBe₂Ge₂-type (space group P4/nmm). Its low-temperature physical properties were investigated by means of magnetization, electrical resistivity, and heat capacity measurements, performed down to 0.35 K. The experiments revealed bulk superconductivity below T_{c} = 2 K. The obtained data indicate that ThIr₂Si₂ is a weakly-coupled type-II BCS superconductor.
5
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Magnetic Behaviour in CeNiGa_{2} and Ce_{2}Ni_{2}Ga

100%
Kaczorowski D., Rogl P.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
289-293
EN
The bulk properties of CeNiGa_{2} and Ce_{2}Νi_{2}Ga were studied by means of magnetic susceptibility, magnetization and electrical resistivity measurements. It was found that CeNiGa_{2} is an antiferromagnetically ordered dense Kondo system whereas Ce_{2}Ni_{2}Ga exhibits a fluctuating valence behaviour.
6
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Multi-Step Magnetic Phase Transition in CeRh_3Si_2 Studied by Specific Heat Measurements

100%
Pikul A., Kaczorowski D.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
235-237
EN
High-quality single crystal of a novel cerium silicide CeRh_3Si_2, crystallizing with the orthorhombic ErRh_3Si_2-type structure, was grown by the Czochralski pulling method and studied by means of specific heat measurements. The antiferromagnetic ordering of the compound manifests itself as a pronounced lambda-shaped anomaly at T_N = 4.72(3) K, and is followed by a spike-shaped anomaly due to spin reorientation at T_t = 4.48(2) K, in good agreement with the previously reported magnetic susceptibility data. Both transitions are very sensitive to applied magnetic field - they split into four separate anomalies, which independently shift to lower temperatures with rising field. Several scenarios are proposed as possible explanations of the multi-step character of the magnetic ordering in CeRh_3Si_2.
7
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Breakdown of the De Gennes Scaling in Y_{1-x}Dy_{x}Ni_{2}B_{2}C

81%
Drzazga Z., Winiarska A., Winiarski A., Kaczorowski D.
Acta Physica Polonica A
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2000
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vol. 97
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issue 1
221-224
EN
Single crystals of Y_{1-x}Dy_{x}Ni_{2}B_{2}C (1 ≤ x ≤ 0.7) were examined by X-ray diffraction and stoichiometry was attested by XPS measurements. The superconducting transition temperature T_{c} and Neel temperature T_{N} were determined by means of magnetisation measurements. A dramatic breakdown of the de Gennes scaling in the Dy-rich compounds was found when T_{c}
8
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Structural and Magnetic Properties of Dy(Fe,V,Si)_{12} Compounds

81%
Drzazga Z., Winiarska A., Chrobak A., Kaczorowski D.
Acta Physica Polonica A
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1997
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vol. 92
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issue 2
335-339
EN
An influence of Si on the structural and magnetic properties of Dy(Fe,V,Si)_{12} compounds is studied. X-ray diffraction shows that these materials crystallise in the tetragonal ThMn_{12}-type structure. An increase in the saturation magnetization, the Curie temperatures and magnetocrystalline anisotropy in the Si substitutional systems is observed when compared with DyFe_{12-x}V_{x}. The magnetic properties depend on the preferential site occupation and concentration of Si and V atoms in these compounds.
9
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Electronic Structure of Ternary Antimonides YbPdSb

81%
Hermanowicz M., Jezierski A., Kaczkowski J., Kaczorowski D.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
226-228
EN
In this paper we present the electronic structure and magnetic properties of YbPdSb in low-temperature MgAsAg-type structure and high-temperature TiNiSi-type structure. The calculations were performed by ab initio full-relativistic full potential local orbital method within the local spin density approximation. Ab initio calculations showed the metallic character of YbPdSb compound in both structures. The density of states at the Fermi level is greater in high-temperature than in low-temperature structure.
10
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Quantum Interference in Disordered Ferromagnet U₂NiSi₃

81%
Gnida D., Szlawska M., Wiśniewski P., Kaczorowski D.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
451-453
EN
A single-crystalline sample of disordered ferromagnetic U₂NiSi₃ was investigated by means of electrical resistivity measurements under ambient and high hydrostatic pressure. Temperature dependences of the electrical resistivity clearly reveal interplay of the ferromagnetic ordering and quantum interference effects resulting from crystallographic disorder. Electron-electron interaction manifests itself as a T^{0.5} increase in the in-plane and out-of-plane electrical resistivity below 5 K. Weak localization is observed solely in the ab-plane as a linear-in-T contribution to resistivity, which suggests that internal magnetic field does not break the interference of scattered electron waves in ab-plane. Applied hydrostatic pressure does not affect the T^{0.5} electron-electron interaction contribution, however it diminishes the impact of weak localization on the ab-plane resistivity.
11
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Thermoelectric Power of Single-Crystalline Ce_{2}RhSi_{3}

81%
Szlawska M., Kaczorowski D., Plackowski T., Gulay L.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 1
132-134
EN
High-quality single crystal of Ce_{2}RhSi_{3} was studied by means of thermoelectric power measurements carried out down to 2 K in external magnetic fields up to 13 T. The results obtained above 50 K were interpreted in terms of a modified two-band model that takes into account temperature variation of the width of 4f-derived narrow band located near the Fermi level. At lower temperatures the thermopower exhibits more complex temperature dependences that likely involve interplays of magnetic exchange, Kondo and crystal-field interactions.
12
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Magnetic and Electronic Properties in Series of GdT_{x}Ga_{4-x} Solid Solutions (T = Ni or Cu)

81%
Wiśniewski P., Gorzelniak R., Kaczorowski D.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
382-384
EN
We present results of extensive measurements of magnetic susceptibility, electrical resistance, specific heat and thermoelectric power of two series of solid solutions GdNi_{x}Ga_{4-x} and GdCu_{x}Ga_{4-x}, for ranges of doping x from 0.6 to 1 and from 1 to 1.5, respectively. All studied phases display the Curie-Weiss behaviour of magnetic susceptibility and antiferromagnetic ordering at temperatures below 23 K. Substitution of gallium with transition metal atoms has strong influence on Néel temperatures of all studied phases, shifting them by few K, depending on x. Metamagnetic-like anomalies are observed for some compositions. Behaviour of the electrical resistivity reveals metallic nature of all samples. Their magnetic ordering is reflected in low-temperature anomalies of the resistivity and the heat capacity.
13
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Magnetic Order and SdH Effect in Half-Heusler Phase ErPdBi

81%
Pavlosiuk O., Filar K., Wiśniewski P., Kaczorowski D.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 2
656-658
EN
Single crystals of ErPdBi were grown from Bi-flux. The crystal structure of MgAgAs-type was confirmed using X-ray diffraction. Magnetization, magnetic susceptibility, electrical resistance and heat capacity measurements revealed an antiferromagnetic phase transition at T_{N} = 1.2 K. At high temperatures, the electrical resistance has a semiconducting-like character (dR/dT < 0 ). The resistance starts decreasing with decreasing T below 15 K and shows a very sharp drop below T_{N} but remains finite down to 0.4 K. Hence, no obvious evidence of superconductivity was found in the electrical transport data. On the other hand, the real part of AC magnetic susceptibility is negative below T_{C} = 1.6 K and its imaginary component has a clear maximum at this temperature that might be associated with the onset of superconducting state. The electrical resistance revealed Shubnikov-de Haas oscillations in magnetic fields 8-33 T. Their amplitude decreases with increasing T and disappears above 10 K. Cyclotron mass determined from this dependence is 0.21 m_{e}.
14
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Magnetic and Transport Properties of Possibly Topologically Nontrivial Half-Heusler Bismuthides RMBi (R = Y, Gd, Dy, Ho, Lu; M = Pd, Pt)

81%
Pavlosiuk O., Kaczorowski D., Wiśniewski P.
Acta Physica Polonica A
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2016
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vol. 130
|
issue 2
573-576
EN
High quality single crystals of some representatives of half-Heusler family were grown from Bi-flux. For single crystals characterization, X-ray diffraction and scanning electron microscopy techniques were used. The low-temperature physical properties of the synthesized crystals were determined by means of magnetization, magnetic susceptibility, electrical resistivity and heat capacity measurements. For each compound but LuPtBi, the electrical resistivity varies in a semimetallic manner at high temperatures, and exhibits a metallic character at low temperatures. LuPtBi is metallic in the whole temperature range studied. The bismuthides HoPdBi, LuPdBi, LuPtBi and YPtBi were found superconducting below the critical temperature T_{c} = 0.7, 1.8, 0.9, and 0.96 K, respectively. For the compounds GdPdBi, DyPdBi and HoPdBi, an antiferromagnetic ordering was found to set in below T_{N} = 12.8, 3.7, and 1.9 K, respectively. HoPdBi is thus an intriguing material in which both cooperative phenomena coexist.
15
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Magnetocaloric Effect in Antiferromagnetic Half-Heusler Alloy DyNiSb

81%
Synoradzki K., Ciesielski K., Kaczorowski D.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
691-693
EN
The low-temperature magnetic, thermal and magnetocaloric properties of the half-Heusler compound DyNiSb were studied on polycrystalline samples. The temperature variations of the magnetization and the heat capacity revealed a phase transition from paramagnetic to antiferromagnetic state at the Néel temperature T_{N} = 3.1 K. The compound exhibits normal and inverse magnetocaloric effect with the isothermal magnetic entropy change reaching 5.2 J/(kg K) at 4.8 K for a magnetic field change of 3 T. The estimated refrigerant capacity is about 58 J/kg.
16
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Antiferromagnetic Order in the Half-Heusler Phase TbPdBi

81%
Pavlosiuk O., Kleinert M., Wiśniewski P., Kaczorowski D.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
498-500
EN
Single crystals of TbPdBi, a representative of the group of half-Heusler bismuthides, were studied by means of magnetic susceptibility, heat capacity, electrical resistivity, magnetostriction and thermal expansion measurements. The compound was characterized as an antiferromagnet with the Néel temperature T_{N} ≈5.3 K. Neutron diffraction experiment confirmed the antiferromagnetic ordering and yielded the propagation vector k=(1/2,1/2,1/2). Remarkably, this k vector is in accord with the recently developed theory of antiferromagnetic topological insulators.
17
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Anomalous Transport and Thermal Properties of the Solid Solutions U_{1-x}Th_{x}Cu_{5}M (M = Al, Ga, In and Sn)

81%
Troć R., Tran V., Kaczorowski D., Czopnik A.
Acta Physica Polonica A
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2000
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vol. 97
|
issue 1
25-35
EN
UCu_{5}M-type compounds are moderate heavy fermion systems with an antiferromagnetic order below T_{N} = 18, 16-25, and 25 K for M = Al, (Ga, In), and In, respectively, and a ferrimagnetic order with T_{C} = 54 K for M = Sn. We present the results of magnetoresistance measurements as a function of temperature and applied magnetic field for the pure compounds and for their solid solutions containing Th, i.e. U_{1-x}Th_{x}Cu_{5}M. Only in the case of UCu_{5}In a substantial positive contribution to the magnetoresistance was observed at low temperatures, as for normal antiferromagnets. For the Al- and Sn-based alloys the magnetoresistance at low temperatures is negative, and its field variation proves the existence of Kondo-type interactions. On Th-substitution the magnetic phase transition is shifted to lower temperature and simultaneously the magnetoresistance becomes less negative. The field dependence of the magnetoresistance of these alloys can be well described by the Coqblin-Schrieffer model. Interestingly, the heat capacity measurements have revealed a general tendency to increase the linear coefficient γ with magnetic dilution of a given UCu_{5}M compound by Th-substitution. This feature reflects an enlargement of the effective mass of conduction electrons with the increase in both the unit cell volume and magnetic dilution. Such a tendency is also observed for the system UCu_{5}(In_{1-x}Ga_{x}), though the unit cell is here suppressed with increasing x. Thus, a similar physical picture is reached in all these systems but involving probably different mechanisms.
18
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Low-Temperature Specific Heat and Magnetocaloric Effect in RCu_2Ge_2 (R = Dy-Tm) Compounds

81%
Gondek Ł., Kaczorowski D., Pikul A., Szytuła A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
391-393
EN
The magnetocaloric effect in RCu_2Ge_2 (R = Dy-Tm) was investigated by means of specific heat measurements. The compounds order antiferromagnetically at 6.2 K (DyCu_2Ge_2), 5.6 K (HoCu_2Ge_2), 3.0 K (ErCu_2Ge_2), and 3.9 K (TmCu_2Ge_2), and some of them exhibit additional magnetic transitions in the ordered state. In an external magnetic field the low-temperature specific heat changes significantly, which can be attributed to metamagnetic-like transitions. In this temperature region, the investigated samples show distinctly different magnetocaloric effect.
19
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Substitution Study on the Coherent Kondo State in CeCu_{5}In

81%
Kaczorowski D., Kalychak Y., Zaremba V.
Acta Physica Polonica A
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2000
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vol. 97
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issue 1
189-192
EN
Ternary alloys CeCu_{5-x}In_{1+x} were studied by means of magnetic and electrical resistivity measurements. In CeCu_{5}In a coherent Kondo state without long-range magnetic order develops at low temperatures. It transforms into an incoherent Kondo state upon small substitution of In for Cu.
20
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Magnetic Ordering in ErFe_{0.3}Ge_{2} and ErNi_{0.65}Ge_{2} Compounds

71%
Penc B., Arulraj A., Kaczorowski D., Szytuła A., Wawrzyńska E.
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|
issue 4
595-598
EN
The magnetic ordering in ErFe_{0.3}Ge_{2} and ErNi_{0.65}Ge_{2} compounds crystallizing in the orthorhombic structure of the CeNiSi_{2}-type has been investigated by neutron diffraction and magnetic measurements. The Er magnetic moments have been found to order antiferromagnetically below 2.5 K in ErFe_{0.3}Ge_{2} and 2.3 K in ErNi_{0.65}Ge_{2}. The magnetic structure of the former compound can be described by the propagation vector k = (0.044(1), 0, 0.384(1)). The Er magnetic moments are aligned along the a-axis and alternate with the sequence ++- in the unit cell. At 1.5 K they are equal to 5.9(1) μ_{B}. In contrast, the magnetic unit cell of ErNi_{0.65}Ge_{2} has been established to be equal to the chemical one. The magnetic moments in this compound are arranged in a collinear manner pointing along the a-axis with the sequence +-+-. The Er moment value measured at 1.5 K is 2.90(8) μ_{B}.
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