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Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ.
Sci Rep. 2020 Jun 24; 10(1):10239.SR

Abstract

We present an extensive study of vortex dynamics in a high-quality single crystal of HgBa2CuO4+δ, 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 Hp(T), second magnetization peak Hsmp(T), and irreversibility field Hirr(T) all decay exponentially at low temperatures and exhibit an abrupt change in behavior at high temperatures T/Tc >~ 0.5. By measuring the rates of thermally activated vortex motion (creep) S(T, H) = |dlnM(T, H)/dlnt|, 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+Show Affiliations

Department of Physics, Colorado School of Mines, Golden, CO, 80401, USA. serenaeley@mines.edu. Los Alamos National Laboratory, Los Alamos, NM, 87545, USA. serenaeley@mines.edu.Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA. Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany.Pulsed Field Facility, National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32581222

Citation

Eley, Serena, et al. "Vortex Phases and Glassy Dynamics in the Highly Anisotropic Superconductor HgBa2CuO4+δ." Scientific Reports, vol. 10, no. 1, 2020, p. 10239.
Eley S, Willa R, Chan MK, et al. Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ. Sci Rep. 2020;10(1):10239.
Eley, S., Willa, R., Chan, M. K., Bauer, E. D., & Civale, L. (2020). Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ. Scientific Reports, 10(1), 10239. https://doi.org/10.1038/s41598-020-65224-5
Eley S, et al. Vortex Phases and Glassy Dynamics in the Highly Anisotropic Superconductor HgBa2CuO4+δ. Sci Rep. 2020 Jun 24;10(1):10239. PubMed PMID: 32581222.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Vortex phases and glassy dynamics in the highly anisotropic superconductor HgBa2CuO4+δ. AU - Eley,Serena, AU - Willa,Roland, AU - Chan,Mun K, AU - Bauer,Eric D, AU - Civale,Leonardo, Y1 - 2020/06/24/ PY - 2019/12/20/received PY - 2020/04/21/accepted PY - 2020/6/26/entrez PY - 2020/6/26/pubmed PY - 2020/6/26/medline SP - 10239 EP - 10239 JF - Scientific reports JO - Sci Rep VL - 10 IS - 1 N2 - We present an extensive study of vortex dynamics in a high-quality single crystal of HgBa2CuO4+δ, 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 Hp(T), second magnetization peak Hsmp(T), and irreversibility field Hirr(T) all decay exponentially at low temperatures and exhibit an abrupt change in behavior at high temperatures T/Tc >~ 0.5. By measuring the rates of thermally activated vortex motion (creep) S(T, H) = |dlnM(T, H)/dlnt|, 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. SN - 2045-2322 UR - https://www.unboundmedicine.com/medline/citation/32581222/Vortex_phases_and_glassy_dynamics_in_the_highly_anisotropic_superconductor_HgBa2CuO4+δ L2 - http://dx.doi.org/10.1038/s41598-020-65224-5 DB - PRIME DP - Unbound Medicine ER -
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