Two phase transitions in ${(d_{x^2-y^2}+is)}$-wave superconductors

Details Two phase transitions in ${(d_{x^2-y^2}+is)}$-wave superconductors Two phase transitions in ${(d_{x^2-y^2}+is)}$-wave superconductors

1999-08-06

arxiv.org/abs/cond-mat/9908101v1

Physica C, 322 (1999) 37

Physics

Condensed Matter

Superconductivity

Latex file, 6 pages, 7 postscript figures, Accepted in Physica C

Scientific paper

10.1016/S0921-4534(99)00401-3

We study numerically the temperature dependencies of specific heat, susceptibility, penetration depth, and thermal conductivity of a coupled $(d_{x^2-y^2}+is)$-wave Bardeen-Cooper-Schreiffer superconductor in the presence of a weak s-wave component (1) on square lattice and (2) on a lattice with orthorhombic distorsion. As the temperature is lowered past the critical temperature $T_c$, a less ordered superconducting phase is created in $d_{x^2-y^2}$ wave, which changes to a more ordered phase in $(d_{x^2-y^2}+is)$ wave at $T_{c1}$. This manifests in two second-order phase transitions. The two phase transitions are identified by two jumps in specific heat at $T_c$ and $T_{c1}$. The temperature dependencies of the superconducting observables exhibit a change from power-law to exponential behavior as temperature is lowered below $T_{c1}$ and confirm the new phase transition.

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