Conductivity anomalies in Y–Ba–Cu–O at 40K and 100K under high quasihydrostatic pressures |
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Authors: | V Sankara Sastry S Kalavathy B K Guha R Baskaran U De J Janaki |
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Institution: | Materials Science Laboratory , Indira Gandhi Centre for Atomic Research , Kalpakkam, 603102, Tamil Nadu, India |
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Abstract: | Electrical resistance measurements at low temperatures and high quasihydrostatic pressures on superconducting and non-superconducting varieties of Y0.8Ba1.2Cu2O5 (obtained by annealing in oxygen and air respectively) show striking anomalies in the vicinity of 100K and 40K. Arguments are presented to show that these anomalies as also the occurrence of T 's in the oxide superconductors either in the vicinity of 100K or of 40K are connected with their layered structure containing planes of Cu-O otahedral complexes. |
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Keywords: | Spin-lattice relaxation time reorientation small angle torsional oscillations activation energy phase transition |
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