| Issue |
Europhys. Lett.
Volume 65, Number 1, January 2004
|
|
|---|---|---|
| Page(s) | 89 - 95 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-10048-8 | |
| Published online | 01 December 2003 | |
Possible inverse melting of vortex lattice
in high-
superconductors
1
National Laboratory of Solid State Microstructures, Nanjing University Nanjing 210093, PRC
2
Department of Physics, Southeast University - Nanjing 210096, PRC
Received:
8
September
2003
Accepted:
22
October
2003
Using molecular-dynamic simulations for a vortex lattice with
random pinning, thermal fluctuations and vortex-vortex
interactions, we study the order-disorder transition from a Bragg
glass (BG) to an amorphous vortex glass (VG) or a vortex liquid
(VL) in the pinning strength-temperature phase diagram. The
order-disorder transition line is determined by calculating the
static structure factor of vortex lattice and the finite-size
exponent. A portion of the BG region is found to be sandwiched in
between the VG phase at lower temperatures and VL phase at higher
temperatures, exhibiting inverse melting behavior observed
recently on 
crystals by Avraham
et al. (Nature, 411 (2001) 451). This unusual
behavior is attributed to the temperature-enhanced interaction
between vortices.
PACS: 74.25.Qt – Vortex lattices, flux pinning, flux creep / 74.25.Op – Mixed states, critical fields, and surface sheaths / 74.25.Sv – Critical currents
© EDP Sciences, 2004
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