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

Journal Article · · Physical Review B
 [1];  [2];  [3]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Universidad de Buenos Aires (Argentina); Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET (Argentina)
  3. Universidad de Buenos Aires (Argentina)
+ Show Author Affiliations
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 λC 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. Finally, this spectroscopic tool may stimulate further pinscape characterization in other superconducting systems.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Scientific and Technical Research Council; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; University of Buenos Aires
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1488402
Alternate ID(s):
OSTI ID: 1484063
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 18 Vol. 98; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Thermal creep induced by cooling a superconducting vortex lattice journal February 2020
Thermal creep induced by cooling a superconducting vortex lattice text January 2020

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