Magnetization amplification in the interlayer pairing superconductor 4Hb-TaS$_2$
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866914862090682368 |
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| author | Liu, Chunxiao Chatterjee, Shubhayu Scaffidi, Thomas Berg, Erez Altman, Ehud |
| author_facet | Liu, Chunxiao Chatterjee, Shubhayu Scaffidi, Thomas Berg, Erez Altman, Ehud |
| contents | A recent experiment on the bulk compound 4Hb-TaS$_2$ reveals an unusual time-reversal symmetry-breaking superconducting state that possesses a magnetic memory not manifest in the normal state. Here we provide a mechanism for this observation by studying the magnetic and electronic properties of 4Hb-TaS$_2$. We discuss the criterion for a small magnetization in the normal state in terms of spin and orbital magnetizations. Based on an analysis of lattice symmetry and Fermi surface structure, we propose that 4Hb-TaS$_2$ realizes superconductivity in the interlayer, equal-spin channel with a gap function whose phase winds along the Fermi surface by an integer multiple of $6π$. The enhancement of the magnetization in the superconducting state compared to the normal state can be explained if the state with a gap winding of $6π$ is realized, accounting for the observed magnetic memory. We discuss how this superconducting state can be probed experimentally by spin-polarized scanning tunneling microscopy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_10389 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Magnetization amplification in the interlayer pairing superconductor 4Hb-TaS$_2$ Liu, Chunxiao Chatterjee, Shubhayu Scaffidi, Thomas Berg, Erez Altman, Ehud Superconductivity A recent experiment on the bulk compound 4Hb-TaS$_2$ reveals an unusual time-reversal symmetry-breaking superconducting state that possesses a magnetic memory not manifest in the normal state. Here we provide a mechanism for this observation by studying the magnetic and electronic properties of 4Hb-TaS$_2$. We discuss the criterion for a small magnetization in the normal state in terms of spin and orbital magnetizations. Based on an analysis of lattice symmetry and Fermi surface structure, we propose that 4Hb-TaS$_2$ realizes superconductivity in the interlayer, equal-spin channel with a gap function whose phase winds along the Fermi surface by an integer multiple of $6π$. The enhancement of the magnetization in the superconducting state compared to the normal state can be explained if the state with a gap winding of $6π$ is realized, accounting for the observed magnetic memory. We discuss how this superconducting state can be probed experimentally by spin-polarized scanning tunneling microscopy. |
| title | Magnetization amplification in the interlayer pairing superconductor 4Hb-TaS$_2$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2307.10389 |