Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu$_5$Rh$_6$Sn$_{18}$
| Autor: | Bhattacharyya, A., Adroja, D. T., Quintanilla, J., Hillier, A. D., Kase, N., Strydom, A. M., Akimitsu, J. |
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| Rok vydání: | 2014 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.91.060503 |
| Popis: | The superconducting state of the caged type compound Lu$_5$Rh$_6$Sn$_{18}$ has been investigated by using magnetization, heat capacity, and muon-spin relaxation or rotation ($\mu$SR) measurements and the results interpreted on the basis of the group theoretical classifications of the possible pairing symmetries and a simple model of the resulting quasiparticle spectra. Our zero-field $\mu$SR measurements clearly reveal the spontaneous appearance of an internal magnetic field below the transition temperature, which indicates that the superconducting state in this material is characterized by the broken time-reversal symmetry. Further the analysis of temperature dependence of the magnetic penetration depth measured using the transverse field $\mu$SR measurements suggest an isotropic $s$-wave character for the superconducting gap. This is in agreement with the heat capacity behavior and we show that it can be interpreted in terms of a non unitary triplet state with point nodes and an open Fermi surface. Comment: 5 pages, 5 figures, SUPPLEMENTAL MATERIAL. appears in Physical Review B: Rapid Communications (2015) |
| Databáze: | arXiv |
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