Strong-coupling theory of magnetic-exciton-mediated superconductivity in UPd2Al3
P. McHale, P. Fulde, P. Thalmeier
DOI 10.1103/PhysRevB.70.014513 · Physical Review B
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Abstract
There is compelling evidence from inelastic-neutron-scattering and tunneling experiments that the heavy-fermion superconductor UPd2Al3 can be understood as a dual system consisting of magnetic excitons, arising from crystal-field-split U4+ levels, coupled to delocalized f electrons. We have computed the superconducting transition temperature and the mass renormalization arising from a dual model with maximal spin anisotropy using a strong-coupling approach. We find an instability to two possible opposite-spin-pairing states with even- or odd-parity gap functions. Each has a line node perpendicular to the z direction, in agreement with NMR relaxation-rate, specific-heat and thermal-conductivity measurements. In addition, both have total spin component Sz=0, compatible with the observation of a pronounced Knight shift and Hc2 Pauli limiting. For parameter values appropriate to UPd2Al3, the calculated superconducting transition temperature and mass renormalization agree well with experiment for representative values of the coupling constant.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure not reported | unknown |
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