The observation of π-shifts in the Little-Parks effect in 4Hb-TaS2

Avior Almoalem, Irena Feldman, Ilay Mangel, Michael Shlafman, Yuval E. Yaish, Mark H. Fischer, Michael Moshe, Jonathan Ruhman, Amit Kanigel*

*Corresponding author for this work

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Finding evidence of non-trivial pairing states is one of the greatest experimental challenges in the field of unconventional superconductivity. Such evidence requires phase-sensitive probes susceptible to the internal structure of the order parameter. We report the measurement of the Little-Parks effect in the unconventional superconductor candidate 4Hb-TaS2. In half of our rings, which are fabricated from single-crystals, we find a π-shift in the transition-temperature oscillations. According to theory, such a π-shift is only possible if the order parameter is non-s-wave. In the absence of crystallographic defects, the shift provides evidence of a multi-component order parameter. Thus, this observation increases the likelihood of the two-component order parameter scenario in 4Hb-TaS2. Furthermore, we show that Tc is enhanced as a function of the out-of-plane field when a constant in-plane field is applied, which we explain using a two-component order-parameter.

Original languageEnglish
Article number4623
JournalNature Communications
Issue number1
StatePublished - Dec 2024

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