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We investigate the pairing symmetry of the ordered honeycomb network superconductor BaPtSb with broken inversion symmetry. There is a preliminary μSR measurement report below critical temperature (Tc) suggesting the superconducting state with time-reversal symmetry breaking (TRSB). In this paper, first principles calculation is performed and we find the effective tight-binding model which reproduces the Fermi surfaces consisting of Pt 5d<SUB>x2-y2</SUB> , 5d<SUB>xy</SUB> and Sb 5p<SUB>z</SUB> orbitals mainly. In order to discuss the pairing symmetry of BaPtSb we classify the gap functions based on crystal point group and solve the gap equations, and the condensation energies are calculated. Consequently, on the most dominant Fermi surface, chiral d-wave state is most stable among the TRSB states.
목차
I. INTRODUCTION
II. THE ELECTRONIC STRUCTURE AND THE EFFECTIVE MODEL
III. THE GAP EQUATIONS AND THE CONDENSATION ENERGIES
IV. SUMMARY AND DISCUSSION
REFERENCES
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