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Title: Reentrant Fulde-Ferrell-Larkin-Ovchinnikov state in small-sized superconductors

Abstract

We study the effect of a parallel magnetic field in a thin and small superconductor. The field suppresses superconductivity through Zeeman coupling while stabilizing the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state at high fields before superconductivity is destroyed. When the spatial period of FFLO state is comparable to the size of the superconductor, there is a strong commensuration effect, which modifies the superconducting phase diagram. We investigate the FFLO state and the phase diagram in the presence of strong commensuration effect both for the s-and d-wave superconductors using the Bogoliubov–de Gennes equation, Green function approach, and Ginzburg-Landau theory. Here, we found that the superconducting phase diagram is strongly modulated. Interestingly, there is reentrance of superconductivity upon increasing the magnetic field. The commensuration effect of the FFLO state can be used to detect the FFLO state in experiments.

Authors:
 [1];  [2]; ORCiD logo [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Merced, CA (United States). School of Natural Sciences
  2. Univ. of California, Merced, CA (United States). School of Natural Sciences
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1511619
Report Number(s):
LA-UR-18-30667
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 5; 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; Material Science

Citation Formats

Kim, Tom, Chien, Chih-Chun, and Lin, Shi-Zeng. Reentrant Fulde-Ferrell-Larkin-Ovchinnikov state in small-sized superconductors. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.054509.
Kim, Tom, Chien, Chih-Chun, & Lin, Shi-Zeng. Reentrant Fulde-Ferrell-Larkin-Ovchinnikov state in small-sized superconductors. United States. doi:10.1103/PhysRevB.99.054509.
Kim, Tom, Chien, Chih-Chun, and Lin, Shi-Zeng. Tue . "Reentrant Fulde-Ferrell-Larkin-Ovchinnikov state in small-sized superconductors". United States. doi:10.1103/PhysRevB.99.054509.
@article{osti_1511619,
title = {Reentrant Fulde-Ferrell-Larkin-Ovchinnikov state in small-sized superconductors},
author = {Kim, Tom and Chien, Chih-Chun and Lin, Shi-Zeng},
abstractNote = {We study the effect of a parallel magnetic field in a thin and small superconductor. The field suppresses superconductivity through Zeeman coupling while stabilizing the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state at high fields before superconductivity is destroyed. When the spatial period of FFLO state is comparable to the size of the superconductor, there is a strong commensuration effect, which modifies the superconducting phase diagram. We investigate the FFLO state and the phase diagram in the presence of strong commensuration effect both for the s-and d-wave superconductors using the Bogoliubov–de Gennes equation, Green function approach, and Ginzburg-Landau theory. Here, we found that the superconducting phase diagram is strongly modulated. Interestingly, there is reentrance of superconductivity upon increasing the magnetic field. The commensuration effect of the FFLO state can be used to detect the FFLO state in experiments.},
doi = {10.1103/PhysRevB.99.054509},
journal = {Physical Review B},
number = 5,
volume = 99,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
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This content will become publicly available on February 19, 2020
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