2017
DOI: 10.1103/physrevb.96.180501
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Time-reversal symmetry breaking in the noncentrosymmetric superconductor Re6Hf : Further evidence for unconventional behavior in the α -Mn family of materials

Abstract: The discovery of new families of unconventional superconductors is important both experimentally and theoretically, especially if it challenges current models and thinking. By using muon spin relaxation in zero-field, time-reversal symmetry breaking has been observed in Re6Hf. Moreover, the temperature dependence of the superfluid density exhibits s-wave superconductivity with an enhanced electron-phonon coupling. This, coupled with the results from isostructural Re6Zr, shows that the Re6X family are indeed a … Show more

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Cited by 79 publications
(111 citation statements)
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“…In this regard, we systematically began the investigation on Re-based compounds with an α-Mn structure. The unconventional superconductivity was observed in a few members of the Re 6 X family, e.g., Re 6 Zr and Re 6 Hf, which provides the evidence of time-reversal symmetry breaking (TRSB) in the superconducting ground state [25,26]. The relaxation rates associated with the TRSB signal in both the compounds were similar.…”
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confidence: 58%
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“…In this regard, we systematically began the investigation on Re-based compounds with an α-Mn structure. The unconventional superconductivity was observed in a few members of the Re 6 X family, e.g., Re 6 Zr and Re 6 Hf, which provides the evidence of time-reversal symmetry breaking (TRSB) in the superconducting ground state [25,26]. The relaxation rates associated with the TRSB signal in both the compounds were similar.…”
mentioning
confidence: 58%
“…The above function was fitted to the ZF asymmetry spectra collected at various temperatures above and below T c , which yields the temperature dependence of fit parameters σ ZF and as shown in Figs , which is close to the superconducting transition temperature. Such a systematic increase in σ ZF below T c was also identified in other members of the Re 6 X (X = Hf, Zr) [25,26] family by μSR measurements. This particular behavior was attributed to the formation of spontaneous magnetic fields below T c , which in turn confirmed time-reversal symmetry breaking in this compound.…”
Section: Where (T ) = 0 δ(T /T C ) the Temperature Dependence Of Thementioning
confidence: 72%
“…18 and pure Re, the spontaneous magnetic fields revealed by zero-field µSR below T c indicate time-reversal symmetry breaking and thus unconventional superconductivity. The concomitant occurrence of TRSB in centrosymmetric Re and noncentrosymmetric ReT (T = transition metal), yet its preservation in the isostructural noncentrosymmetric superconductors Mg 10 Ir 19 B 16 and Nb 0.5 Os 0.5 , strongly suggests that the local electronic structure of Re is crucial for understanding the TRSB superconducting state in Re and ReT . We discuss the superconducting order parameter symmetries that are compatible with the observations.…”
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confidence: 99%
“…In general, TRSB below T c and a lack of spatial-inversion symmetry of the crystal structure are independent events. Yet, in a few cases, such as in LaNiC 2 [13], La 7 Ir 3 [14], and, in particular, in the Re-based compounds Re 6 Zr [15], Re 6 Hf [16], Re 6 Ti [17], and Re 24 Ti 5 [18], TRSB below T c is concomitant with an existing lack of crystal inversion symmetry. Such an unusually frequent occurrence of TRSB among the superconducting ReT binary alloys (T = transition metal) is rather puzzling.…”
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confidence: 99%
“…We diagonalize the mean-field Hamiltonian in Eqn. (14) using standard Bololiubov transformation [53] to obtain…”
Section: Mean-field Theory Of the Toy Modelmentioning
confidence: 99%