The Crystal Field Potential of PrOs4Sb12: Consequences for Superconductivity
E. A. Goremychkin, R. Osborn, E. D. Bauer, M. B. Maple, N. A., Frederick, W. M. Yuhasz, F. M. Woodward, and J. W. Lynn
TL;DR
This paper investigates the crystal field levels in PrOs4Sb12 and suggests that inelastic quadrupolar scattering enhances its superconductivity, making it a unique case where Coulomb interactions increase Tc.
Contribution
It provides the first evidence that aspherical Coulomb scattering can dominate magnetic pair-breaking and boost superconducting transition temperature in PrOs4Sb12.
Findings
Crystal field level scheme with Gamma_1 singlet ground state.
Mass enhancement consistent with inelastic exchange scattering.
Aspherical Coulomb scattering likely increases Tc.
Abstract
The results of inelastic neutron scattering provide a solution for the crystal field level scheme in PrOs4Sb12 in which the ground state in the cubic crystal field potential of Th symmetry is a Gamma_1 singlet. The conduction electron mass enhancement is consistent with inelastic exchange scattering, and we propose that inelastic quadrupolar, or aspherical Coulomb, scattering is responsible for enhancing the superconducting transition temperature. PrOs4Sb12 appears to be the first compound in which aspherical Coulomb scattering is strong enough to overcome magnetic pair-breaking and increase Tc.
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