Unusual Upper Critical Field of the Ferromagnetic Superconductor UCoGe
N. T. Huy, D. E. de Nijs, Y. K. Huang, A. de Visser
DOI 10.1103/PhysRevLett.100.077002 · Physical Review Letters
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Abstract
We report upper critical field Bc2(T) measurements on a single-crystalline sample of the ferromagnetic superconductor UCoGe. Bc2(0) obtained for fields applied along the orthorhombic axes exceeds the Pauli limit for B∥a,b and shows a strong anisotropy Bc2a≃Bc2b≫Bc2c. This provides evidence for an equal-spin pairing state and a superconducting gap function of axial symmetry with point nodes along the c axis, which is also the direction of the uniaxial ferromagnetic moment m0=0.07μB. An unusual curvature or kink is observed in the temperature variation of Bc2, which possibly indicates UCoGe is a two-band ferromagnetic superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | unknown |
| UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.6 | Pressure not reported | midpoint |
| URhGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UIr Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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