Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 5

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Magnon Drag Effect on Resistivity and Thermoelectric Power of Semimetallic Antiferromagnet USb

100%
Henkie Z., Wiśniewski P.
Acta Physica Polonica A
|
1995
|
vol. 88
|
issue 6
1103-1112
EN
Resistivity ρ(T) and absolute thermoelectric power S(Τ) have been measured for USb single crystals characterized by different residual resis­tivity ratios, RRR = ρ(300 K)/ρ(4.2 K). A 50 μV/K peak of S(Τ) observed at 40 K for high RRR crystal vanishes for low RRR one. The ρ ∝ Τ^{4} depen­dence observed below 40 K changes to the ρ ∝ Τ^{5/2} one. These variations are ascribed to reduction of the magnon drag effect by an increased inco­herent magnetic scattering of carriers, possibly induced by a small change of composition. Resistivity anomaly is analysed above the antiferromagnetic transition temperature T_{N}. We have found that resistivity decreases as tlnt in the range 0.02 ≤ t ≤ 0.35, where t = (Τ - T_{N})/T_{N}. It is ascribed to a semimetallic character of this compound.
2
Content available remote

High-Field Magnetisation and Magnetoresistance οf U_3P_4 and Its Solid Solution U_3(P,As)_4

81%
Wiśniewski P., Kozlova N., Freudenberger J., Henkie Z.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 1
254-256
EN
Magnetisation and longitudinal magnetoresistance of single-crystal samples of two compositions: stoichiometric compound U_3P_4 and its solid solution U_3(P,As)_4 (with As:P ratio close to 1) were measured in pulsed magnetic fields with strength up to 47 T, and in temperatures from 4 K up to few tens of kelvins above the Curie temperatures (135 K and 181 K for both compositions, respectively). Field was always applied along a hard magnetic direction [100]. Magnetisation experiments showed no sign of expected magnetic-moment-reorientation transition and data look quantitatively similar for both compositions. On the other hand, longitudinal magnetoresistance (MR) is remarkably different for each composition. Onset of the above mentioned transition can be held responsible for broad maxima observed in MR(B) curves for U_3(P,As)_4. Values of magnetic field strength corresponding to these maxima follow a linear dependence on temperature. We assume that these features of MR(B) curves are due to progressive deformation of magnetic structure of U_3(P,As)_4 in high magnetic fields.
3
Content available remote

Electron Transport Properties of UAsSe

81%
Henkie Z., Fabrowski R., Wojakowski A.
Acta Physica Polonica A
|
1994
|
vol. 85
|
issue 2
249-252
EN
Anisotropy of resistivity (2-450 K), in-plane thermoelectric power (4-300 K) and Hall's constants (200-450 K) for UAsSe were determined. It is highly anisotropic, uniaxial ferromagnet below T_{C} = 113 K. The compound is classified as Kondo lattice system becoming noncoherent below ≈ 0.5T_{C}.
4
Content available remote

Effect of Spin Reorientational Transition on Magnetoresistivity of Noncolinear Ferromagnet U_{3}As_{4}

81%
Bakker K., Wiśniewski P., Henkie Z., Franse J.
Acta Physica Polonica A
|
1994
|
vol. 85
|
issue 2
245-248
EN
Transverse magnetoresistivity (H ∥ [001]; and current ∥ [110]) of U_{3}As_{4} has been measured in field up to 35 T. An abrupt change of the magnetoresistivity behaviour from saturated (low field) to unsaturated (high field) type was observed at the spin reorientational transition (19.1 T at 4.2 K). The transition is accompanied by a peak in the magnetoresistivity. The behaviour is ascribed to fractional spin polarization of the band electrons.
5
Content available remote

Specific Heatof the Filled Skutterudite Superconductor LaOs₄As₁₂

81%
Juraszek J., Henkie Z., Cichorek T.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 2
597-599
EN
We investigated low-temperature specific heat of the filled skutterudite compound LaOs₄As₁₂ with a transition temperature T_{c} = 3.2 K. A moderate size of a specific-heat jump points at a weak electron-phonon coupling in this material. At T < T_{c}, the electronic contribution to the specific heat was found to be at variance with the predictions for an s-wave superconductor with one energy gap. Additionally, we observed an upward curvature of the upper critical field near the transition temperature. Both features provide some indications towards multiband superconductivity, although anisotropy effects as a viable cause of the observed anomalies in LaOs₄As₁₂ cannot be excluded. Similarities to a probable two-band superconductor LaRu₄As₁₂ are discussed.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.