Evidence of a two-component order parameter in 4Hb-TaS2 in the Little-Parks effect
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
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2022
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| _version_ | 1866910473356574720 |
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| author | Almoalem, Avior Feldman, Irena Shlafman, Michael Yaish, Yuval E. Fischer, Mark H. Moshe, Michael Ruhman, Jonathan Kanigel, Amit |
| author_facet | Almoalem, Avior Feldman, Irena Shlafman, Michael Yaish, Yuval E. Fischer, Mark H. Moshe, Michael Ruhman, Jonathan Kanigel, Amit |
| contents | Finding unambiguous 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 measure the Little-Parks effect to provide clear evidence of an unconventional superconducting order parameter in 4Hb-TaS$_2$. Namely, we find a $π$-shift in the transition-temperature oscillations of rings made of a single crystal. We argue that such an effect can only occur if the underlying order parameter belongs to a two-dimensional representation, in other words there are two degenerate order parameters right at the transition. Additionally, we show that $T_c$ is enhanced as a function of the out-of-plane field when a constant in-plane field is applied. Such an increase is consistent with a chiral state, which again, in general only emerges from a two-component order parameter. In combination with previous experiments, our results strongly indicate that 4Hb-TaS$_2$ indeed realizes a chiral superconductor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2208_13798 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Evidence of a two-component order parameter in 4Hb-TaS2 in the Little-Parks effect Almoalem, Avior Feldman, Irena Shlafman, Michael Yaish, Yuval E. Fischer, Mark H. Moshe, Michael Ruhman, Jonathan Kanigel, Amit Superconductivity Strongly Correlated Electrons Finding unambiguous 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 measure the Little-Parks effect to provide clear evidence of an unconventional superconducting order parameter in 4Hb-TaS$_2$. Namely, we find a $π$-shift in the transition-temperature oscillations of rings made of a single crystal. We argue that such an effect can only occur if the underlying order parameter belongs to a two-dimensional representation, in other words there are two degenerate order parameters right at the transition. Additionally, we show that $T_c$ is enhanced as a function of the out-of-plane field when a constant in-plane field is applied. Such an increase is consistent with a chiral state, which again, in general only emerges from a two-component order parameter. In combination with previous experiments, our results strongly indicate that 4Hb-TaS$_2$ indeed realizes a chiral superconductor. |
| title | Evidence of a two-component order parameter in 4Hb-TaS2 in the Little-Parks effect |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2208.13798 |