Magnetic phase transformations and superconductivity in Dy 0.8 Y 0.2 Rh 4 B 4

The results of experimental studies of the magnetic and the superconducting properties of the compound Dy 0.8 Y 0.2 Rh 4 B 4 with tetragonal body-centered crystal structure of the perovskite type ( Lu Ru 4 B 4 ) are presented. It is shown that the compound undergoes a paramagnet-ferrimagnet phase tr...

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Veröffentlicht in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2008-11, Vol.34 (11), p.909-917
Hauptverfasser: Dmitriev, V. M., Zaleskiĭ, A., Khlybov, E. P., Rybal’chenko, L. F., Khristenko, E. V., Ishchenko, L. A., Terekhov, A. V., Kostyleva, I. E., Lachenkov, S. A.
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Sprache:eng
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Zusammenfassung:The results of experimental studies of the magnetic and the superconducting properties of the compound Dy 0.8 Y 0.2 Rh 4 B 4 with tetragonal body-centered crystal structure of the perovskite type ( Lu Ru 4 B 4 ) are presented. It is shown that the compound undergoes a paramagnet-ferrimagnet phase transition at the Curie temperature T C ≈ 30.5 K and its magnetic compensation temperature T comp ≈ 17 K . According to resistance measurements, the compound becomes a ferrimagnetic superconductor at T c onset ≈ 5.9 K which undergoes a ferrimagnet-antiferromagnet phase transition at T N ≈ 2.7 K while still remaining a superconductor. The specific heat exhibits a sharp maximum at this temperature. Point-contact Andreev reflection spectroscopy is used to measure the temperature and field dependences of the order parameter Δ ( T , H ) and the temperature dependence of the upper critical field H c 2 ( T ) . The dependences obtained differ radically from those generally accepted for conventional superconductors. The results obtained are discussed in connection with the possibility of triplet pairing in Dy 0.8 Y 0.2 Rh 4 B 4 .
ISSN:1063-777X
1090-6517
DOI:10.1063/1.3009586