Volume 65, Number 1, January 2004
|Page(s)||89 - 95|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Possible inverse melting of vortex lattice in high- superconductors
National Laboratory of Solid State Microstructures, Nanjing University Nanjing 210093, PRC
2 Department of Physics, Southeast University - Nanjing 210096, PRC
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.