Change of parity of the order parameter in high-temperature superconductors due to impurities
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (United States)
The dependence of the critical temperature on impurity concentration is calculated for a model of a tetragonal high-{ital T}{sub {ital c}} superconductor described in a previous paper [A. A. Abrikosov, Phys. Rev. B {bold 52}, R15738 (1995)] under conditions when the odd ({ital d} symmetry) order parameter is favorable for a clean substance. The critical temperature decreases rapidly with increasing impurity concentration according to the general pair-braking formula and tends to zero at a critical concentration. Since, however, the critical temperature for the phase with an even order parameter is only weakly influenced by impurities, it eventually exceeds the {ital T}{sub {ital c}} of the odd phase, and this means a phase transition to the even phase. The {ital T}{sub {ital c}} curve is expected to have a kink and a long tail. {copyright} {ital 1996 The American Physical Society.}
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 280221
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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