| Issue |
EPL
Volume 80, Number 1, October 2007
|
|
|---|---|---|
| Article Number | 17002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/80/17002 | |
| 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
Received:
21
June
2007
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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