Pronounced Enhancement of the Lower Critical Field and Critical Current Deep in the Superconducting State of PrOs4Sb12
T. Cichorek, A. C. Mota, F. Steglich, N. A. Frederick, W. M. Yuhasz, M. B. Maple
DOI 10.1103/PhysRevLett.94.107002 · Physical Review Letters
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Abstract
We have observed an unexpected enhancement of the lower critical field Hc1(T) and the critical current Ic(T) deep in the superconducting state below T≈0.6 K (T/Tc≈0.3) in the filled skutterudite heavy fermion superconductor PrOs4Sb12. From a comparison of the behavior of Hc1(T) with that of the heavy fermion superconductors U1−xThxBe13 and UPt3, we speculate that the enhancement of Hc1(T) and Ic(T) in PrOs4Sb12 reflects a transition into another superconducting phase that occurs below T/Tc≈0.3. An examination of the literature reveals unexplained anomalies in other physical properties of PrOs4Sb12 near T/Tc≈0.3 that correlate with the features we have observed in Hc1(T) and Ic(T).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.86 | Pressure unresolved | onset |
| PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.72 | Pressure unresolved | unknown |
| PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.86 | Pressure unresolved | onset |
| U1-xThxBe13 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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