Anisotropy and pressure dependence of the upper critical field of the ferromagnetic superconductor UGe2
I. Sheikin, A. Huxley, D. Braithwaite, J. P. Brison, S. Watanabe, K. Miyake, J. Flouquet
DOI 10.1103/PhysRevB.64.220503 · Physical Review B
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Abstract
The temperature and pressure dependence of the upper critical field, Hc2, of the ferromagnetic superconductor UGe2 is reported for fields applied along all three crystallographic axes. For fields parallel to the easy magnetic a axis, the relationship between an unusual reentrant behavior of Hc2 and a field-induced transition associated with a change in the electronic density of states is reviewed. For transverse field directions a significant evolution in the behavior of Hc2 with pressure is found. As the pressure is decreased the dependence of Hc2 on temperature for fields along the crystal’s c axis acquires a positive curvature that extends from the critical temperature, Tc, down to almost the lowest temperature measured (Tc/10) where Hc2 exceeds the usual weak coupling paramagnetic and orbital limits.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.757 | 1.14 GPa | midpoint |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.685 | 1.2 GPa | midpoint |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.466 | 1.32 GPa | midpoint |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.403 | 1.35 GPa | midpoint |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.258 | 1.5 GPa | midpoint |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.225 | 1.53 GPa | midpoint |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (TMTSF)2PF6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UBe13 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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