Title :
Hysteretic flux dynamics in a detwinned YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// crystal from SQUID picovoltmeter measurements
Author :
Gordeev, S.N. ; Volkozub, A.V. ; de Groot, P.A.J. ; Gagnon, R. ; Taillefer, L. ; Khanin, V.V. ; Matlashov, A.N. ; Polyakov, Yu.A. ; Slobodchikov, V.Yu.
Author_Institution :
Dept. of Phys., Southampton Univ., UK
fDate :
6/1/1997 12:00:00 AM
Abstract :
We report measurements of resistivity hysteresis in both temperature and magnetic field performed on a detwinned YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// single crystal in the region of the vortex lattice melting transition. We have found evidence that the observed hysteresis cannot be explained by current-induced nonequilibrium effects. The measured voltage-current characteristics for the sample in the overheated state also display hysteretic behaviour. This strongly supports the idea that the vortex solid can be melted by transport current.
Keywords :
barium compounds; electrical resistivity; flux-line lattice; high-temperature superconductors; hysteresis; magnetoresistance; yttrium compounds; HTSC; SQUID picovoltmeter measurements; YBa/sub 2/Cu/sub 3/O/sub 7/; current-induced nonequilibrium effects; detwinned YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// crystal; hysteretic flux dynamics; overheated state; resistivity hysteresis; voltage-current characteristics; vortex lattice melting transition; vortex solid; Conductivity; Electrical resistance measurement; Lattices; Magnetic field measurement; Magnetic hysteresis; Performance evaluation; Physics; SQUIDs; Temperature dependence; Thermodynamics;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
