Mixing of superconducting dx2−y2 state with s-wave states for different filling and temperature

2000/12/21 by Angsula Ghosh, Sadhan K. Adhikari
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1016/s0921-4534(00)01774-3

published as Physica C 355 (2001) 77-86 · 10 pages, 9 figures, accepted in Physica C

arxiv created 2000/12/21 · openalex publication_date 2001/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We study the order parameter for mixed-symmetry states involving a major d_x²-y² state and various minor s-wave states (s, s_xy, and s_x²+y²) for different filling and temperature for mixing angles 0 and π/2. We employ a two-dimensional tight-binding model incorporating second-neighbor hopping for tetragonal and orthorhombic lattice. There is mixing for the symmetric s state both on tetragonal and orthorhombic lattice. The s_xy state mixes with the d_x²-y² state only on orthorhombic lattice. The s_x²+y² state never mixes with the d_x²-y² state. The temperature dependence of the order parameters is also studied.

Citations

• Destruction of the Fermi surface in underdoped high-Tc superconductors