Phase Transition from a D
نویسنده
چکیده
The temperature dependencies of specific heat and spin susceptibility of a coupled dx2−y2+idxy superconductor in the presence of a weak dxy component are investigated in the tight-binding model (1) on square lattice and (2) on a lattice with orthorhombic distortion. As the temperature is lowered past the critical temperature Tc, first a less ordered dx2−y2 superconductor is created, which changes to a more ordered dx2−y2 + idxy superconductor at Tc1(< Tc). This manifests in two second order phase transitions identified by two jumps in specific heat at Tc and Tc1. The temperature dependencies of the superconducting observables exhibit a change from power-law to exponential behavior as temperature is lowered below Tc1 and confirm the new phase transition. PACS number(s): 74.20.Fg, 74.62.-c, 74.25.Bt
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