Exciton Mediated Superconductivity in PrOs4Sb12
Masashige Matsumoto, Mikito Koga
TL;DR
This paper explores how excitons mediate superconductivity in PrOs4Sb12, revealing a d-wave pairing symmetry influenced by exciton dispersion and magnetic field-induced order.
Contribution
It introduces a model where excitons induce attractive interactions leading to unconventional d-wave superconductivity in PrOs4Sb12.
Findings
Excitons create an attractive interaction between conduction electrons.
The superconducting state has a d-wave symmetry with broken time-reversal symmetry.
Magnetic field induces order related to excitonic states.
Abstract
The most important character of the exotic superconductor PrOs4Sb12 is the existence of low-lying excitations (excitons) with a finite energy gap and it appears as the magnetic field-induced order above 4.5 T. We focus on the a_u conduction band, which hybridizes with a Pr 4f^2 state strongly, coupled to the excitons. It results in an attractive interaction between the conduction electrons. The symmetry of the superconducting order parameter is determined by dispersion relation of the exciton. For the bcc system PrOs4Sb12, a d-wave state [kx ky + omega ky kz + omega^2 kz kx, omega=exp(pm i 2 pi/3)] is stabilized with broken time reversal symmetry.
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