Broken time-reversal symmetry in the cubic skutterudite-like superconductor Y3Ru4Ge13
A. Kataria, J. A. T. Verezhak, O. Prakash, R. K. Kushwaha, A. Thamizhavel, S. Ramakrishnan, M. S. Scheurer, A. D. Hillier, R. P. Singh
DOI 10.1103/PhysRevB.108.214512 · Physical Review B
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Abstract
The microscopic properties of the superconducting cubic skutterudite-like material Y3Ru4Ge13 are investigated using muon spin relaxation and rotation (μSR) measurements. Zero-field μSR measurements reveal the presence of a spontaneous internal field with a magnitude of ≃0.18 mT below the superconducting transition temperature, indicating broken time-reversal symmetry in the ground state. In line with previous experiments, transverse-field μSR measurements are consistent with a fully developed superconductivity gap in Y3Ru4Ge13. Our observations point towards the relevance of electronic correlations beyond electron-phonon coupling as the superconducting origin and indicate that spin-orbit coupling is likely not the key driving force behind the spontaneous breaking of time-reversal symmetry in this system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y3Ru4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure not reported | unknown |
| Y3Ru4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure not reported | unknown |
| Y3Ru4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure not reported | unknown |
| Y3Ru4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | onset |
| Lu3Os4Ge13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| PrRu4Sb12 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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