Nodeless superconductivity in 4Hb−TaS2 with broken time-reversal symmetry
Yuwei Zhou, Fanyu Meng, Yanen Huang, Jiawen Zhang, Jin Zhan, Ye Chen, Yu Liu, Hechang Lei, Michael Smidman, Huiqiu Yuan
DOI 10.1103/tb8r-yylc · Physical Review B
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Abstract
The transition metal dichalcogenide 4Hb−TaS2 exhibits characteristics of topological edge modes and two-component superconductivity with time-reversal symmetry breaking (TRSB). The nature of the superconducting order parameter is a crucial issue that requires experimental investigation. Here, we report measurements of the magnetic penetration depth using a tunnel-diode-oscillator based technique, as well as the specific heat. Both the specific heat and the change in magnetic penetration depth [Δλ(T)] display an exponentially activated temperature dependence, providing evidence for nodeless superconductivity in 4Hb−TaS2. Moreover, the deduced superfluid density can be well described by a two-gap s-wave model, and such multigap superconductivity is consistent with there being multiple bands crossing the Fermi energy. These results constrain the possible pairing symmetries of 4Hb−TaS2.
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