Volume 80, Number 1, October 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||05 September 2007|
Deconfinement of vortices with continuously variable fractions of the unit flux quanta in two-gap superconductors
Department of Physics and Mathematics, Aoyama Gakuin University - 5-10-1, Fuchinobe, Sagamihara, 229-8558, Japan
Accepted: 9 August 2007
We propose a new stage of confinement-deconfinement transition, which can be observed in laboratory. In two-gap superconductors (SCs), two kinds of vortex exist and each of them carries a continuously variable fraction of the unit flux quanta = . The confined state of these two is a usual vortex and stable in the low-temperature region of the system under a certain magnetic field above . We see an analogy to quarks in a charged pion. An entropy gain causes two fractional vortices to be deconfined above a certain temperature.
PACS: 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
© Europhysics Letters Association, 2007
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