Open AccessFlux vortex dynamics in type-II superconductors
Author(s) -
Jan Srpčič,
Dominic Moseley,
F. Pérez,
Kaiyuan Huang,
Yunhua Shi,
Anthony Dennis,
Mark Ainslie,
A.M. Campbell,
Martin Boll,
D. A. Cardwell,
John Durrell
Publication year - 2019
Publication title -
superconductor science and technology/superconductor science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.033
H-Index - 105
eISSN - 1361-6668
pISSN - 0953-2048
DOI - 10.1088/1361-6668/ab5b53
Subject(s) - flux pinning , vortex , condensed matter physics , type ii superconductor , magnetic flux , superconductivity , penetration depth , magnetic field , flux (metallurgy) , london penetration depth , physics , pinning force , lattice (music) , materials science , high temperature superconductivity , critical current , mechanics , optics , quantum mechanics , acoustics , metallurgy
The flux-pinning landscape in type-II superconductors determines the response of the flux line lattice to changing magnetic fields. Typically, the flux vortex behaviour is hysteretic and well described within the framework of the Bean critical-state model and its extensions. However, if the changing magnetic field does not move the flux vortices from their pinning sites, their response remains linear and reversible. The vortex displacement, then, is characterised by the Campbell penetration depth, which itself is related directly to the effective size of the pinning potential. Here, we present measurements of the Campbell penetration depth (and the effective size of the pinning potential) as a function of magnetic field in a single-grain bulk GdBa 2 Cu 3 O 7 − δ superconductor using a pick-up coil method. Hence, the hysteretic losses, which take into account the reversible vortex movement, are established.