| Issue |
Europhys. Lett.
Volume 46, Number 6, June II 1999
|
|
|---|---|---|
| Page(s) | 787 - 793 | |
| Section | Condensed matter: electronic structure, electrical, magneticand optical properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00333-0 | |
| Published online | 01 September 2002 | |
Flux lattice melting in twinned
single crystals
Superconductivity Research Laboratory, ISTEC, 10-13 Shinonome 1-Chome, Koto-ku, Tokyo
135-0062, Japan
Received:
18
January
1999
Accepted:
7
April
1999
We report on the observation of a first-order melting transition of the flux
line lattice in a twinned 
single crystal by transport and
magnetization measurements. The position of kink and hysteresis in
resistance, and magnetization jump coincides in the B-T plane. The observed
melting transition is a strong function of 
partial pressure during
growth. The first-order transition gradually becomes continuous and a peak in
critical current density first emerges with oxygen partial pressure
to Ar atmosphere. The melting line shifts to the low-temperature side
due to increasing disorders. The results suggest that the twin planes do not
suppress the melting transition in a clean crystal. Our results also
demonstrate the existence of a first-order melting transition in a twinned
RE-123 system containing rare-earth magnetic ions.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.60.Jg – Critical currents / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
© EDP Sciences, 1999
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