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Title: Fulde-Ferrell-Larkin-Ovchinnikov pairing induced by a Weyl nodal line in an Ising superconductor with a high critical field

Abstract

Superconductivity and electron topology are two quantum phenomena that have attracted much interest, but no causal relationship between them has been reported because superconductivity is a many-body effect due to electron-electron interaction, while electron topology is a single-particle manifestation of electron states. In this work, we demonstrate that electron topology can induce Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing in Ising Bardeen-Cooper-Schrieffer (IBCS) superconductors. Specifically, we predict that the nonmagnetic metals of the MA2Z4 family, including α1-TaSi2P4, α1-TaSi2N4, α2-TaGe2P4, α1-NbSi2P4, and α2-NbGe2P4 monolayers, are all IBCS superconductors with a transition temperature ranging from a few to tens of degrees Kelvin. The intrinsic IBCS pairing alone will enhance the in-plane critical field Bc to ~20–60 times the Pauli limit Bp, and the extrinsic FFLO pairing evoked by topological Weyl nodal lines under a magnetic field can further double the Bc/Bp ratio. Our findings not only enrich the fundamental relationship between superconductivity and electron topology, but they also yield an effective approach to enhance the robustness of superconductivity.

Authors:
 [1]; ORCiD logo [2]
  1. Ocean University of China, Shandong (China)
  2. Univ. of Utah, Salt Lake City, UT (United States)
Publication Date:
Research Org.:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Natural Science Foundation of Shandong Province
OSTI Identifier:
1905831
Grant/Contract Number:  
FG02-04ER46148; 12004357; ZR2020QA053
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. B
Additional Journal Information:
Journal Volume: 105; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Zhang, Xiaoming, and Liu, Feng. Fulde-Ferrell-Larkin-Ovchinnikov pairing induced by a Weyl nodal line in an Ising superconductor with a high critical field. United States: N. p., 2022. Web. doi:10.1103/physrevb.105.024505.
Zhang, Xiaoming, & Liu, Feng. Fulde-Ferrell-Larkin-Ovchinnikov pairing induced by a Weyl nodal line in an Ising superconductor with a high critical field. United States. https://doi.org/10.1103/physrevb.105.024505
Zhang, Xiaoming, and Liu, Feng. Thu . "Fulde-Ferrell-Larkin-Ovchinnikov pairing induced by a Weyl nodal line in an Ising superconductor with a high critical field". United States. https://doi.org/10.1103/physrevb.105.024505. https://www.osti.gov/servlets/purl/1905831.
@article{osti_1905831,
title = {Fulde-Ferrell-Larkin-Ovchinnikov pairing induced by a Weyl nodal line in an Ising superconductor with a high critical field},
author = {Zhang, Xiaoming and Liu, Feng},
abstractNote = {Superconductivity and electron topology are two quantum phenomena that have attracted much interest, but no causal relationship between them has been reported because superconductivity is a many-body effect due to electron-electron interaction, while electron topology is a single-particle manifestation of electron states. In this work, we demonstrate that electron topology can induce Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing in Ising Bardeen-Cooper-Schrieffer (IBCS) superconductors. Specifically, we predict that the nonmagnetic metals of the MA2Z4 family, including α1-TaSi2P4, α1-TaSi2N4, α2-TaGe2P4, α1-NbSi2P4, and α2-NbGe2P4 monolayers, are all IBCS superconductors with a transition temperature ranging from a few to tens of degrees Kelvin. The intrinsic IBCS pairing alone will enhance the in-plane critical field Bc to ~20–60 times the Pauli limit Bp, and the extrinsic FFLO pairing evoked by topological Weyl nodal lines under a magnetic field can further double the Bc/Bp ratio. Our findings not only enrich the fundamental relationship between superconductivity and electron topology, but they also yield an effective approach to enhance the robustness of superconductivity.},
doi = {10.1103/physrevb.105.024505},
journal = {Physical Review. B},
number = 2,
volume = 105,
place = {United States},
year = {Thu Jan 06 00:00:00 EST 2022},
month = {Thu Jan 06 00:00:00 EST 2022}
}

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