Nonanalytical angular dependence of the upper critical magnetic field in a quasionedimensional superconductor
Abstract
We have derived the socalled gap equation, which determines the upper critical magnetic field, perpendicular to conducting chains of a quasionedimensional superconductor. By analyzing this equation at low temperatures, we have found that the calculated angular dependence of the upper critical magnetic field is qualitatively different than that in the socalled effective mass model. In particular, our theory predicts a nonanalytical angular dependence of the upper critical magnetic field, H _{ c2}(0)  H _{ c2}(α) ∼ α^{3/2}, when magnetic field is close to some special crystallographic axis and makes an angle α with it. We discuss possible experiments on the superconductor (DMET)_{2}I_{3} to discover this nonanalytical dependence.
 Publication:

Soviet Journal of Experimental and Theoretical Physics Letters
 Pub Date:
 October 2012
 DOI:
 10.1134/S0021364012150052
 arXiv:
 arXiv:1209.4672
 Bibcode:
 2012JETPL..96..176L
 Keywords:

 Condensed Matter  Superconductivity
 EPrint:
 5 pages