Fulde-Ferrell state in heavy-fermion superconductors
Guimei Yin, Kazumi Maki
DOI 10.1103/PhysRevB.48.650 · Physical Review B
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Abstract
Within the weak-coupling model we study the upper critical field of S-wave and D-wave superconductors in the clean limit close to the Chandrasekhar-Clogston limit. We find for parameters derived from dHc2(T)/dTT=Tc of a single crystal of the recently discovered heavy-fermion superconductor UPd2Al3 that the Fulde-Ferrell (FF) state is possible for the S-wave and one of the D-wave superconductors of D6h symmetry but not for the hybrid state. Indeed, choosing a g factor slightly less than 2, we can describe the temperature dependence of Hc2(T) for both H∥Rc and H∥a extremely well. On the other hand the D-wave model predicts the transition into the FF state at T/Tc=0.29 in sharp contrast to the experimental observation T/Tc0=0.8.
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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