Extreme in-plane upper critical magnetic fields of heavily doped quasi-two-dimensional transition metal dichalcogenides

P. Samuely, P. Szabó, J. Kačmarčík, A. Meerschaut, L. Cario, A. G. M. Jansen, T. Cren, M. Kuzmiak, O. Šofranko, and T. Samuely
Phys. Rev. B 104, 224507 – Published 20 December 2021
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Abstract

Extreme in-plane upper critical magnetic fields Bc2//ab strongly violating the Pauli paramagnetic limit have been observed in the misfit layer (LaSe)1.14(NbSe2) and (LaSe)1.14(NbSe2)2 single crystals with Tc=1.23 and 5.7 K, respectively. The crystals show a two-dimensional to three-dimensional transition at temperatures slightly below Tc with an upturn in the temperature dependence of Bc2//ab, a temperature-dependent huge superconducting anisotropy and a cusplike behavior of the angular dependence of Bc2. Both misfits are characterized by a strong charge transfer from LaSe to NbSe2. As shown in our previous work, (LaSe)1.14(NbSe2)2 is electronically equivalent to the highly doped NbSe2 monolayers. Then, the strong upper critical field can be attributed to the Ising coupling recently discovered in atomically thin transition metal dichalcogenides with strong spin-orbit coupling and a lack of inversion symmetry. A very similar behavior is found in (LaSe)1.14(NbSe2), where the charge transfer is nominally twice as big, which could eventually lead to complete filling of the NbSe2 conduction band and opening superconductivity in LaSe. Whatever the particular superconducting mechanism would be, a common denominator in both misfits is that they behave as a stack of almost decoupled superconducting atomic layers, proving that Ising superconductivity can also exist in bulk materials.

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  • Received 8 July 2021
  • Revised 9 November 2021
  • Accepted 30 November 2021

DOI:https://doi.org/10.1103/PhysRevB.104.224507

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

P. Samuely1,2,*, P. Szabó1, J. Kačmarčík1, A. Meerschaut3, L. Cario3, A. G. M. Jansen4,5, T. Cren6, M. Kuzmiak1, O. Šofranko1,2, and T. Samuely2

  • 1Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences, 04001 Košice, Slovakia
  • 2Centre of Low Temperature Physics, Faculty of Science, P. J. Šafárik University, 04001 Košice, Slovakia
  • 3Institut des Matériaux Jean Rouxel, Université de Nantes and CNRS-UMR 6502, Nantes 44322, France
  • 4Universté Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, F-38000 Grenoble, France
  • 5Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, F-38042 Grenoble, France
  • 6Institut des NanoSciences de Paris, Sorbonne Université and CNRS-UMR 7588, Paris 75005, France

  • *Corresponding author: samuely@saske.sk

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Issue

Vol. 104, Iss. 22 — 1 December 2021

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