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Title: Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy

Abstract

In type-II superconductors, the macroscopic response of vortex matter to an external perturbation depends on the local interaction of flux lines with the pinning landscape (pinscape). The (Campbell) penetration depth lambda(c) of an ac field perturbation is often associated with a phenomenological pinning curvature. However, this basic approach is unable to capture thermal hysteresis effects observed in a variety of superconductors. The recently developed framework of strong-pinning theory has established a quantitative relationship between the microscopic pinscape and macroscopic observables. Specifically, it identifies history-dependent vortex arrangements as the primary source for thermal hysteresis in the Campbell response. In this work, we show that this interpretation is well-suited to capture the experimental results of the clean superconductor NbSe2, as observed through Campbell response (linear ac susceptibility) and small-angle neutron scattering measurements. Furthermore, we exploit the hysteretic Campbell response upon thermal cycling to extract the temperature dependence of microscopic pinning parameters from bulk measurements, specifically the pinning force and pinning length. This spectroscopic tool may stimulate further pinscape characterization in other superconducting systems.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; University of Buenos Aires; National Scientific and Technical Research Council
OSTI Identifier:
1488402
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 98; Journal Issue: 18
Country of Publication:
United States
Language:
English

Citation Formats

Willa, Roland, Marziali Bermúdez, Mariano, and Pasquini, Gabriela. Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.184520.
Willa, Roland, Marziali Bermúdez, Mariano, & Pasquini, Gabriela. Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy. United States. doi:10.1103/PhysRevB.98.184520.
Willa, Roland, Marziali Bermúdez, Mariano, and Pasquini, Gabriela. Thu . "Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy". United States. doi:10.1103/PhysRevB.98.184520.
@article{osti_1488402,
title = {Thermal hysteresis of the Campbell response as a probe for bulk pinning landscape spectroscopy},
author = {Willa, Roland and Marziali Bermúdez, Mariano and Pasquini, Gabriela},
abstractNote = {In type-II superconductors, the macroscopic response of vortex matter to an external perturbation depends on the local interaction of flux lines with the pinning landscape (pinscape). The (Campbell) penetration depth lambda(c) of an ac field perturbation is often associated with a phenomenological pinning curvature. However, this basic approach is unable to capture thermal hysteresis effects observed in a variety of superconductors. The recently developed framework of strong-pinning theory has established a quantitative relationship between the microscopic pinscape and macroscopic observables. Specifically, it identifies history-dependent vortex arrangements as the primary source for thermal hysteresis in the Campbell response. In this work, we show that this interpretation is well-suited to capture the experimental results of the clean superconductor NbSe2, as observed through Campbell response (linear ac susceptibility) and small-angle neutron scattering measurements. Furthermore, we exploit the hysteretic Campbell response upon thermal cycling to extract the temperature dependence of microscopic pinning parameters from bulk measurements, specifically the pinning force and pinning length. This spectroscopic tool may stimulate further pinscape characterization in other superconducting systems.},
doi = {10.1103/PhysRevB.98.184520},
journal = {Physical Review B},
number = 18,
volume = 98,
place = {United States},
year = {Thu Nov 01 00:00:00 EDT 2018},
month = {Thu Nov 01 00:00:00 EDT 2018}
}