Open AccessMagnetic-field-induced phase transition of vortex glass states in disordered Josephson junction arrays
Author(s) -
Zhao Zhi-gang,
Ziwei Xu,
Bin Li,
Mei Liu
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.5750
Subject(s) - condensed matter physics , vortex , superconductivity , josephson effect , physics , magnetic field , vortex state , vorticity , pinning force , phase transition , phase (matter) , pi josephson junction , materials science , critical current , quantum mechanics , mechanics
Using the resistively shunted junction modelwe study magnetic-field-induced phase transitions of the vortex glass states in a disordered two-dimensional Josephson junction array. From calculated results of the vorticity of the vortex system and the voltage noise generated by current-driven vortices as a function of the magnetic field the following conclusions can be drawn. 1 With decreasing the magnetic field the vortex system exhibits a reentrant transition from a vortex glass phase to a pinned dilute vortex liquid. 2 There is a peak of voltage noise driven by the current in the vortex glass state. It follows that the system is in a sub-stable state as a result of the competition between ordered and disordered interactions which results in peak effects of the critical current. The calculated results are consistent with recent experimental reports by Okuma and Kamada on disordered and superconducting MoxSi1-x films.