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The most important character of the exotic superconductor PrOs4Sb12 is theexistence of low-lying excitations (excitons) with a finite energy gap and itappears as the magnetic field-induced order above 4.5 T. We focus on the a_uconduction band, which hybridizes with a Pr 4f^2 state strongly, coupled to theexcitons. It results in an attractive interaction between the conductionelectrons. The symmetry of the superconducting order parameter is determined bydispersion relation of the exciton. For the bcc system PrOs4Sb12, a d-wavestate [kx ky + omega ky kz + omega^2 kz kx, omega=exp(pm i 2 pi/3)] isstabilized with broken time reversal symmetry.Comment: 4 page

Exciton Mediated Superconductivity in PrOs4Sb12

Exciton Mediated Superconductivity in PrOs₄Sb₁₂