Layered Superconductor in a Magnetic Field: Breakdown of the Effective Mass Model

Lebed, A. G.

doi:10.1134/s0021364019150025

Cited by 6 publications

(1 citation statement)

References 17 publications

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“…This upturn, together with the thermodynamic signature of an additional phase transition occurring near 10 T in the specific heat and magnetostriction, has been interpreted as consequence of the formation of the FFLO state [17], which allows the superconductor to maintain its state above the Pauli limit. The anisotropic coherence lengths can be deducted from the linear Ginzburg-Landau (GL) fits (dotted lines), which provide an estimation of the GL orbital limit [41] for superconductivity in parallel fields at B c2 = 33 T, as opposed to a low B c2⊥ = 2.2 T.…”

Section: Discussionmentioning

confidence: 99%

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

Cho¹,

Ng²,

Abdel-Hafiez³

et al. 2022

New J. Phys.

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We compare the upper critical field of bulk single-crystalline samples of the two intrinsic transition metal dichalcogenide (TMD) 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 Å 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.

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Section: Discussionmentioning

confidence: 99%