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Title: Vortices in high-performance high-temperature superconductors

Abstract

The behavior of vortex matter in high-temperature superconductors (HTS) controls the entire electromagnetic response of the material, including its current carrying capacity. In this paper, we review the basic concepts of vortex pinning and its application to a complex mixed pinning landscape to enhance the critical current and to reduce its anisotropy. We focus on recent scientific advances that have resulted in large enhancements of the in-field critical current in state-of-the-art second generation (2G) YBCO coated conductors and on the prospect of an isotropic, high-critical current superconductor in the iron-based superconductors. Finally, we discuss an emerging new paradigm of critical current by design—a drive to achieve a quantitative correlation between the observed critical current density and mesoscale mixed pinning landscapes by using realistic input parameters in an innovative and powerful large-scale time dependent Ginzburg–Landau approach to simulating vortex dynamics.

Authors:
 [1];  [1];  [2];  [1];  [3];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Illinois, Chicago, IL (United States). Dept. of Physics. Dept. of Electrical and Mechanical Engineering
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
OSTI Identifier:
1352683
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Reports on Progress in Physics
Additional Journal Information:
Journal Volume: 79; Journal Issue: 11; Journal ID: ISSN 0034-4885
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Kwok, Wai-Kwong, Welp, Ulrich, Glatz, Andreas, Koshelev, Alexei E., Kihlstrom, Karen J., and Crabtree, George W. Vortices in high-performance high-temperature superconductors. United States: N. p., 2016. Web. doi:10.1088/0034-4885/79/11/116501.
Kwok, Wai-Kwong, Welp, Ulrich, Glatz, Andreas, Koshelev, Alexei E., Kihlstrom, Karen J., & Crabtree, George W. Vortices in high-performance high-temperature superconductors. United States. doi:10.1088/0034-4885/79/11/116501.
Kwok, Wai-Kwong, Welp, Ulrich, Glatz, Andreas, Koshelev, Alexei E., Kihlstrom, Karen J., and Crabtree, George W. 2016. "Vortices in high-performance high-temperature superconductors". United States. doi:10.1088/0034-4885/79/11/116501. https://www.osti.gov/servlets/purl/1352683.
@article{osti_1352683,
title = {Vortices in high-performance high-temperature superconductors},
author = {Kwok, Wai-Kwong and Welp, Ulrich and Glatz, Andreas and Koshelev, Alexei E. and Kihlstrom, Karen J. and Crabtree, George W.},
abstractNote = {The behavior of vortex matter in high-temperature superconductors (HTS) controls the entire electromagnetic response of the material, including its current carrying capacity. In this paper, we review the basic concepts of vortex pinning and its application to a complex mixed pinning landscape to enhance the critical current and to reduce its anisotropy. We focus on recent scientific advances that have resulted in large enhancements of the in-field critical current in state-of-the-art second generation (2G) YBCO coated conductors and on the prospect of an isotropic, high-critical current superconductor in the iron-based superconductors. Finally, we discuss an emerging new paradigm of critical current by design—a drive to achieve a quantitative correlation between the observed critical current density and mesoscale mixed pinning landscapes by using realistic input parameters in an innovative and powerful large-scale time dependent Ginzburg–Landau approach to simulating vortex dynamics.},
doi = {10.1088/0034-4885/79/11/116501},
journal = {Reports on Progress in Physics},
number = 11,
volume = 79,
place = {United States},
year = 2016,
month = 9
}

Journal Article:
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  • The terms glass'' and liquid'' are defined in a dynamic sense, with a sublinear response [rho]=[partial derivative][ital E]/[partial derivative][ital j][vert bar][sub [ital j][r arrow]0] characterizing the truly superconducting vortex glass and a finite resistivity [rho]([ital j][r arrow]0)[gt]0 being the signature of the liquid phase. The smallness of [ital j][sub [ital c]]/[ital j][sub o] allows one to discuss the influence of quenched disorder in terms of the weak collective pinning theory. Supplementing the traditional theory of weak collective pinning to take into account thermal and quantum fluctuations, as well as the new scaling concepts for elastic media subject to a randommore » potential, this modern version of the weak collective pinning theory consistently accounts for a large number of novel phenomena, such as the broad resistive transition, thermally assisted flux flow, giant and quantum creep, and the glassiness of the solid state. The strong layering of the oxides introduces additional new features into the thermodynamic phase diagram, such as a layer decoupling transition, and modifies the mechanism of pinning and creep in various ways. The presence of strong (correlated) disorder in the form of twin boundaries or columnar defects not only is technologically relevant but also provides the framework for the physical realization of novel thermodynamic phases such as the Bose glass. On a macroscopic scale the vortex system exhibits self-organized criticality, with both the spatial and the temporal scale accessible to experimental investigations.« less
  • In the mixed state of the high-temperature superconductors (HTSC's) both quasiparticles and magnetic-flux lines diffuse under the influence of a temperature gradient. The thermal diffusion of these species results in the Seebeck effect and the Nernst effect, respectively. A detailed description of the diffusion process is given taking into account the finite Hall angle of the moving quasiparticles and vortices. Our results demonstrate the impact of the Hall effect on the interpretation of experimental data on thermoelectric and thermomagnetic effects in the mixed state of HTSC's. Our model predictions agree well with the experimental data obtained from epitaxial YBa[sub 2]Cu[submore » 3]O[sub 7[minus][delta]] films.« less
  • The interaction of an edge dislocation made of half the superconducting plane with a magnetic interlayer vortex is considered within the framework of the Lawrence-Doniach model with negative as well as positive Josephson interlayer coupling. In the first case the binding energy of the vortex and the dislocation has been calculated by employing a variational procedure. The current distribution around the bound vortex turns out to be asymmetric. In the second case the dislocation carries a spontaneous magnetic half vortex, whose binding energy with the dislocation turns out to be infinite. The half-vortex energy has been calculated by the samemore » variational procedure. Implications of the possible presence of such half vortices for the properties of high-temperature sueprconductors are discussed. We suggest employing artificially made superconductor-ferromagnet superlattices with the half plane removed to observe fractional vortices.« less
  • We discuss the problem of broken time-reversal symmetry near grain boundaries in a d-wave superconductor based on a Ginzburg-Landau theory. It is shown that such a state can lead to fractional vortices on the grain boundary. Both analytical and numerical results show the structure of this type of state. {copyright} {ital 1997} {ital The American Physical Society}