Competition between orbital effects, Pauli limiting, and Fulde-Ferrell-Larkin-Ovchinnikov states in 2D transition metal dichalcogenide superconductors

Chang Woo Cho, Cheuk Yin Ng, Chi Ho Wong, Mahmoud Abdel-Hafiez, Alexander N. Vasiliev, Dmitriy A. Chareev, A. G. Lebed, Rolf Lortz

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We compare the upper critical field of bulk single-crystalline samples of the two intrinsic transition metal dichalcogenide superconductors, 2H-NbSe2 and 2H-NbS2, in high magnetic fields where their layer structure is aligned strictly parallel and perpendicular to the field, using magnetic torque experiments and a high-precision piezo-rotary positioner. While both superconductors show that orbital effects still have a significant impact when the layer structure is aligned parallel to the field, the upper critical field of NbS2 rises above the Pauli limiting field and forms a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, while orbital effects suppress superconductivity in NbSe2 just below the Pauli limit, which excludes the formation of the FFLO state.

Original languageEnglish (US)
Article number083001
JournalNew Journal of Physics
Volume24
Issue number8
DOIs
StatePublished - Aug 1 2022

Keywords

  • Fulde-Ferrell-Larkin-Ovchinnikov state
  • NbS
  • NbSe
  • superconductivity
  • transition metal dichalcogenide

ASJC Scopus subject areas

  • General Physics and Astronomy

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