Selective effects of selenium substitution on superconductivity and magnetic memory in 4Hb-TaS2

Abstract

Disorder plays a central role in correlated quantum materials, but its effects can be highly selective when several electronic orders coexist. The van der Waals heterostructure 4Hb-TaS2 provides such a case, combining superconductivity, charge-order tendencies, strong scattering, and magnetic memory manifested through spontaneous vortices. Here we use Se substitution as a controlled local perturbation of the disorder landscape in 4Hb-TaS2. We find that superconductivity remains remarkably robust while the magnetic memory is strongly suppressed at higher Se concentrations. These results show that Se substitution does not create the hidden magnetic memory, but instead selectively weakens its macroscopic manifestation. More broadly, they reveal a sharp separation between robust superconducting and hidden-memory phases, and a highly disorder-sensitive spontaneous-vortex response in 4Hb-TaS2.

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BibTeX RIS

BibTeX

@misc{gur2026selective,
  title = {{Selective effects of selenium substitution on superconductivity and magnetic memory in 4Hb-TaS2}},
  author = {Shalev Gur and Sajilesh K. P. and Shubam Purwar and Irena Feldman and Ilay Mangel and Nitzan Ragoler and Amit Kanigel and Beena Kalisky},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.39969},
  eprint = {2610.39969},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.39969},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Selective effects of selenium substitution on superconductivity and magnetic memory in 4Hb-TaS2
AU  - Shalev Gur
AU  - Sajilesh K. P.
AU  - Shubam Purwar
AU  - Irena Feldman
AU  - Ilay Mangel
AU  - Nitzan Ragoler
AU  - Amit Kanigel
AU  - Beena Kalisky
PY  - 2026
DA  - 2026/10/29
PB  - arXiv
DO  - 10.48550/arxiv.2610.39969
UR  - https://arxiv.org/abs/2610.39969
AB  - Disorder plays a central role in correlated quantum materials, but its effects can be highly selective when several electronic orders coexist. The van der Waals heterostructure 4Hb-TaS2 provides such a case, combining superconductivity, charge-order tendencies, strong scattering, and magnetic memory manifested through spontaneous vortices. Here we use Se substitution as a controlled local perturbation of the disorder landscape in 4Hb-TaS2. We find that superconductivity remains remarkably robust while the magnetic memory is strongly suppressed at higher Se concentrations. These results show that Se substitution does not create the hidden magnetic memory, but instead selectively weakens its macroscopic manifestation. More broadly, they reveal a sharp separation between robust superconducting and hidden-memory phases, and a highly disorder-sensitive spontaneous-vortex response in 4Hb-TaS2.
ER  -

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