Broken time-reversal symmetry in cubic skutterudite-like superconductor Y$_3$Ru$_4$Ge$_{13}$
| Autor: | Kataria, A., Verezhak, J. A. T., Prakash, O., Kushwaha, R. K., Thamizhavel, A., Ramakrishnan, S., Scheurer, M. S., Hillier, A. D., Singh, R. P. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 108, 214512 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.108.214512 |
| Popis: | The microscopic properties of superconducting cubic skutterudite-like material Y$_3$Ru$_4$Ge$_{13}$ are investigated using muon spin relaxation and rotation ($\mu$SR) measurements. Zero-field $\mu$SR measurements reveal the presence of a spontaneous internal field with a magnitude of $\approx$ 0.18~mT below the superconducting transition temperature, indicating broken time-reversal symmetry in the ground state. In line with previous experiments, transverse-field $\mu$SR measurements are consistent with a fully developed superconductivity gap in Y$_3$Ru$_4$Ge$_{13}$. Our observations point towards the relevance of electronic correlations beyond electron-phonon coupling as 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. Comment: 7 pages, 3 figures |
| Databáze: | arXiv |
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