Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12
A. Maisuradze, W. Schnelle, R. Khasanov, R. Gumeniuk, M. Nicklas, H. Rosner, A. Leithe-Jasper, Yu. Grin, A. Amato, P. Thalmeier
DOI 10.1103/PhysRevB.82.024524 · Physical Review B
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Abstract
Zero- and longitudinal-field muon-spin-rotation (μSR) experiments were performed on the superconductors PrPt4Ge12 and LaPt4Ge12. In PrPt4Ge12 below Tc a spontaneous magnetization with a temperature variation resembling that of the superfluid density appears. This observation implies time-reversal symmetry (TRS) breaking in PrPt4Ge12 below Tc=7.9 K. This remarkably high Tc for an anomalous superconductor and the weak and gradual change in Tc and of the related specific-heat anomaly upon La substitution in La1−xPrxPt4Ge12 suggests that the TRS breaking is due to orbital degrees of freedom of the Cooper pairs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PrPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure not reported | onset |
| LaPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.3 | Pressure not reported | unknown |
| PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.85 | Pressure not reported | unknown |
| LaOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.74 | Pressure not reported | unknown |
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