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Competition between orbital effects, Pauli limiting, and Fulde-Ferrell-Larkin-Ovchinnikov states in 2D transition metal dichalcogenide superconductors
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- Cho, Chang-woo (author)
- Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Clear Water Bay, Hong Kong, Peoples R China.
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- Ng, Cheuk Yin (author)
- Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Clear Water Bay, Hong Kong, Peoples R China.
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- Wong, Chi Ho (author)
- Hong Kong Univ Sci & Technol, Dept Ind & Syst Engn, Kowloon, Hung Hom, 11 Yuk Choi Rd, Hong Kong, Peoples R China.
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- Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Clear Water Bay, Hong Kong, Peoples R China Hong Kong Univ Sci & Technol, Dept Ind & Syst Engn, Kowloon, Hung Hom, 11 Yuk Choi Rd, Hong Kong, Peoples R China. (creator_code:org_t)
- 2022-08-10
- 2022
- English.
- In: New Journal of Physics. - : IOP Publishing Ltd. - 1367-2630. ; 24:8
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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. From the out-of-plane anisotropies, the coherence length perpendicular to the layers of 31 angstrom in NbSe2 is much larger than the interlayer distance, leading to a significant orbital effect suppressing superconductivity before the Pauli limit is reached, in contrast to the more 2D NbS2.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- superconductivity
- Fulde-Ferrell-Larkin-Ovchinnikov state
- transition metal dichalcogenide
- NbSe2
- NbS2
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Cho, Chang-woo
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- Lebed, A. G.
- Lortz, Rolf
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- Uppsala University
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