Peak Effect in Untwinned YBa 2 Cu 3 O 7-δ Single Crystals
- 20 January 1994
- journal article
- Published by IOP Publishing in Europhysics Letters
- Vol. 25 (3) , 225-230
- https://doi.org/10.1209/0295-5075/25/3/012
Abstract
For YBa2Cu3O7-δ untwinned single crystals of differing purity a peak effect of the critical current density as a function of the temperature is observed by transverse a.c. susceptometry at very low frequency. Increasing purity shifts the peak effect towards Tc and globally reduces Jc to lower values. We prove the 3D regime by testing whether or not cutting and reconnecting the flux lines in magnetically induced "force-free configurations" is possible. The peak effect appears to result from the pre-melt softening of the flux line lattice.Keywords
This publication has 13 references indexed in Scilit:
- Direct observation of magnetic flux lattice melting and decomposition in the high-Tc superconductor Bi2.15Sr1.95CaCu2O8+xNature, 1993
- Irreversibility line of monocrystalline : Experimental evidence for a dimensional crossover of the vortex ensemblePhysical Review Letters, 1993
- Vortex lattice melting in untwinned and twinned single crystals ofPhysical Review Letters, 1992
- Experimental evidence for a first-order vortex-lattice-melting transition in untwinned, single crystalPhysical Review Letters, 1992
- Experimental evidence for flux-lattice meltingPhysical Review Letters, 1991
- Apparatus for dynamic and static measurements of mechanical properties of solids and of flux-lattice in type-II superconductors at low frequency (10−5–10 Hz) and temperature (4.7–500 K)Review of Scientific Instruments, 1990
- MACROSCOPICAL THEORY OF LAYERED SUPERCONDUCTORSInternational Journal of Modern Physics B, 1990
- Direct study of magnetic flux penetration and trapping in HTSCPhysica C: Superconductivity and its Applications, 1990
- Pinning in type II superconductorsJournal of Low Temperature Physics, 1979
- Magnetization of High-Field SuperconductorsReviews of Modern Physics, 1964