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Superconducting and Magnetic Phases with 1212-Type of Structure

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Khlybov E., Kostyleva I., Nenkov K., Nizhankovskii V., Palewski T., Warchulska J.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
369-372
EN
Studies of magnetic and transport properties of the 1212 compounds MA'_{2}A''Cu_{2}O_{7-x} (M 3D Al or Tl; A'= Sr or Ba; A''= RE, Y, and Ca) revealed a number of interesting magnetic phenomena. Apart from high-temperature superconductivity, these compounds exhibit spontaneous antiferromagnetism, field induced antiferromagnetism or ferromagnetism. The different magnetic orders and superconductivity may be realized in the same compound as a result of the phase separation.
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Superconductivity and Magnetism of Dy_{1-x}Y_xRh_4B_4: Candidate for Spin-Triplet Cooper Pairing

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Dmitriev V., Zaleski A., Khlybov E., Rybaltchenko L., Khristenko E., Ishchenko L., Terekhov A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
83-90
EN
In this work for the first time we give the evidence that compound Dy_{1-x}Y_x Rh_4B_4 with the tetragonal body-centered crystal structure LuRu_4B_4 is the ferrimagnetic at temperatures T_{Cur}<40 K, ferrimagnetic superconductor at T_C <10 K and antiferromagnetic superconductor at T_N <3 K. No reentrant behavior was found down to T = 0.32 K. For the first time by means of a method of microcontact spectroscopy of the Andreev reflection in point contact Ag-Dy_{0.8}Y_{0.2}Rh_4B_4 the value and temperature and field dependences of superconducting gap parameter∆(T, H) in Dy_{0.8}Y_{0.2}Rh_4B_4 were determined. The value of the ratio 2∆(0)/kT_C is about 4. Some unusual features of∆(T, H) dependences were observed, which give the evidence that the Dy_{1-x}Y_xRh_4B_4 is a candidate for spin-triplet Cooper pairing of charges with the parallel spins.
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