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Title: Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ

Abstract

We present an extensive study of vortex dynamics in a high-quality single crystal of HgBa2CuO4+delta, a highly anisotropic superconductor that is a model system for studying the effects of anisotropy. From magnetization M measurements over a wide range of temperatures T and fields H, we construct a detailed vortex phase diagram. We find that the temperature-dependent vortex penetration field H-p(T), second magnetization peak H-smp(T), and irreversibility field H-irr(T) all decay exponentially at low temperatures and exhibit an abrupt change in behavior at high temperatures T/T-c > similar to 0.5. By measuring the rates of thermally activated vortex motion (creep) S(T, H) = vertical bar dInM(T, H)/dInt vertical bar, we reveal glassy behavior involving collective creep of bundles of 2D pancake vortices as well as temperature- and time tuned crossovers from elastic (collective) dynamics to plastic flow. Based on the creep results, we show that the second magnetization peak coincides with the elastic-to-plastic crossover at low T, yet the mechanism changes at higher temperatures.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]
  1. Colorado School of Mines, Golden, CO (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States); Karlsruhe Inst. of Technology (KIT) (Germany)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); Swiss National Science Foundation (SNSF)
OSTI Identifier:
1648085
Alternate Identifier(s):
OSTI ID: 1765467
Report Number(s):
LA-UR-19-28990
Journal ID: ISSN 2045-2322
Grant/Contract Number:  
89233218CNA000001; 1905909; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Magnetic propertiese and materials; superconducting properties and materials; superconductivity, Hg1201, vortex matter, vortex dynamics, pancake vortices

Citation Formats

Eley, Serena, Willa, Roland, Chan, Mun K., Bauer, Eric D., and Civale, Leonardo. Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ. United States: N. p., 2020. Web. https://doi.org/10.1038/s41598-020-65224-5.
Eley, Serena, Willa, Roland, Chan, Mun K., Bauer, Eric D., & Civale, Leonardo. Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ. United States. https://doi.org/10.1038/s41598-020-65224-5
Eley, Serena, Willa, Roland, Chan, Mun K., Bauer, Eric D., and Civale, Leonardo. Wed . "Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ". United States. https://doi.org/10.1038/s41598-020-65224-5. https://www.osti.gov/servlets/purl/1648085.
@article{osti_1648085,
title = {Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ},
author = {Eley, Serena and Willa, Roland and Chan, Mun K. and Bauer, Eric D. and Civale, Leonardo},
abstractNote = {We present an extensive study of vortex dynamics in a high-quality single crystal of HgBa2CuO4+delta, a highly anisotropic superconductor that is a model system for studying the effects of anisotropy. From magnetization M measurements over a wide range of temperatures T and fields H, we construct a detailed vortex phase diagram. We find that the temperature-dependent vortex penetration field H-p(T), second magnetization peak H-smp(T), and irreversibility field H-irr(T) all decay exponentially at low temperatures and exhibit an abrupt change in behavior at high temperatures T/T-c > similar to 0.5. By measuring the rates of thermally activated vortex motion (creep) S(T, H) = vertical bar dInM(T, H)/dInt vertical bar, we reveal glassy behavior involving collective creep of bundles of 2D pancake vortices as well as temperature- and time tuned crossovers from elastic (collective) dynamics to plastic flow. Based on the creep results, we show that the second magnetization peak coincides with the elastic-to-plastic crossover at low T, yet the mechanism changes at higher temperatures.},
doi = {10.1038/s41598-020-65224-5},
journal = {Scientific Reports},
number = 1,
volume = 10,
place = {United States},
year = {2020},
month = {6}
}

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