Search results

1

Spectroscopy of the Irradiated YBa_{2}Cu_{3}O_{x} Superconductors

100%

Kityk I., Lutciv R., Malynych S., Vasyuk M.

Acta Physica Polonica A

|

1993

|

vol. 84

|

issue 6

1059-1064

EN

Complex investigations of the photoinduced changes in YBa_{2}Cu_{3}O_{x} single crystals were performed. As laser sources the low-power He-Ne, He-Cd, He-Se, N_{2} lasers and YAG:Nd, XeCl pulsed lasers were used. For the investigations the crystalline samples both in super- and semiconducting phases were chosen. A considerably strong dependence of a defectiveness parameter x on the laser power, wavelength and external conditions was observed. The oxygen parameter x shows a tendency to increase for the initially semiconducting phase and to decrease for superconductors. The most interesting result were obtained using XeCl excimer laser, where corresponding changes were observed only under applied hydrostatic pressure (up to 200 MPa) in oxygen atmosphere. In all the cases the penetration depth of the new induced superconducting phase was within 5.5-6.5 μm.

2

Magnetic Properties of Milled and Thermal Relaxed YBa_{2} (Cu_{1-x}Fe_{x})_{3}O_{y}

51%

Timko M., Kováč J., Sargánková I., Zentková M., Mihalik M., Maťaš S., Čiasnohová A.

Acta Physica Polonica A

|

1997

|

vol. 91

|

issue 2

355-358

EN

The influence of the mechanical milling and subsequent thermal relaxation on magnetic and superconducting behaviour of YBa_{2}(Cu_{1-x}Fe _{x})_{3}O_{y} system has been studied. Two methods of heat treatment were used: Set I - slow cooling from 980°C in flowing O_{2} and Set II - reducing at 770°C in flowing Ar_{2} followed by reoxidation in flowing O_{2} below 400°C. The transition to superconductivity, diamagnetic response, critical current density and the effective magnetic moment in the normal state have been estimated. Our measurements indicate that the reducing atmosphere preparation is less detrimental on superconducting properties. The results are discussed in terms of occupancy Cu sites by Fe and redistribution of oxygen atoms.

3

Structural and Physical Properties of the new Stannide Yb₃Pd₄Sn₁₃

51%

Gastaldo F., Giovannini M., Strydom A., Djoumessi R., Čurlík I., Reiffers M., Solokha P., Saccone A.

Acta Physica Polonica A

|

2017

|

vol. 131

|

issue 4

1006-1008

EN

Among the new discovered intermetallics in the Yb-Pd-Sn system, the cubic phase Yb₃Pd₄Sn₁₃, with a lattice parameter of 0.9743(5) nm, emerges as a new member of the R₃T₄Sn₁₃ family (R = rare earth element, T = transition metal) crystallizing in the Yb₃Rh₄Sn₁₃-structure type. The effective magnetic moment μ_{eff}=1.84 μ_{B}/Yb is strongly reduced. Moreover, measurements of magnetic properties, specific heat and resistivity indicate superconductivity below 2.4 K. This compound is found to exhibit a strongly enhanced electronic specific heat at low temperature from which we infer a possible low-lying magnetic phase transition or other source of magnetic entropy.

4

Observation of Superconductivity in Highly Cr-Doped GaP Single Crystals

44%

Gosk J., Strzelecka G., Kowalski G., Hruban A., Kamińska M., Twardowski A., Gronkowski J.

Acta Physica Polonica A

|

2006

|

vol. 110

|

issue 2

189-193

EN

Studying bulk GaP, highly doped with Cr, and searching for possible ferromagnetic semiconductor in view of spintronic applications, we found superconducting behavior of this material unexpectedly. Magnetization techniques and X-ray diffraction were applied to study these crystals. Magnetization revealed superconducting features up to about 6 K and X-ray studies showed that superconductivity might be related to small size Cr precipitates.

5

Magnetic Order and SdH Effect in Half-Heusler Phase ErPdBi

44%

Pavlosiuk O., Filar K., Wiśniewski P., Kaczorowski D.

Acta Physica Polonica A

|

2015

|

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}.

6

Superconducting Properties of Mo_2Re_3B_x-Mo_3Re_2B_x Eutectic

44%

Andrzejewski B., Guilmeau E., Kowalczyk A., Jurga W.

Acta Physica Polonica A

|

2007

|

vol. 111

|

issue 5

727-735

EN

We synthesized, for the first time, superconducting eutectic composed of two new superconducting phases, namely of Mo_2Re_3B_x and of Mo_3Re_2B_x (where x≈1) and investigated its basic transport, magnetic, and microwave properties. The transition temperatures T_c were equal to 6.6 K and to 8.7 K for Mo_3Re_2B_x and Mo_2Re_3B_x compound, respectively. The phases present in the eutectic were identified by means of energy dispersion spectroscopy analyses. It was also shown that the two phases in the eutectic were separated by thin boron interface and formed regular network of the Josephson junctions which very effectively absorbed microwave energy.

Refine search results

Spectroscopy of the Irradiated YBa_{2}Cu_{3}O_{x} Superconductors

Magnetic Properties of Milled and Thermal Relaxed YBa_{2} (Cu_{1-x}Fe_{x})_{3}O_{y}

Structural and Physical Properties of the new Stannide Yb₃Pd₄Sn₁₃

Observation of Superconductivity in Highly Cr-Doped GaP Single Crystals

Magnetic Order and SdH Effect in Half-Heusler Phase ErPdBi

Superconducting Properties of Mo_2Re_3B_x-Mo_3Re_2B_x Eutectic