Physics – Condensed Matter – Superconductivity
Scientific paper
2008-05-21
Phys. Rev. B 78, 224520 (2008)
Physics
Condensed Matter
Superconductivity
13 REVTeX pages, 7 figures
Scientific paper
10.1103/PhysRevB.78.224520
We calculate the upper critical field in superconductors without inversion symmetry at arbitrary temperatures, in the presence of scalar impurities. Both orbital and spin (paramagnetic) mechanisms of pair breaking are considered. The superconducting phase transition at nonzero field occurs into a helical vortex state, in which the order parameter is modulated along the applied field (in a cubic crystal). The helical state is stable with respect to disorder. However, if the difference between the densities of states in the electron bands split by spin-orbit coupling is neglected, then the order parameter modulation is present only at low temperatures, and only if the system is sufficiently clean and paramagnetically limited. This state resembles the Larkin-Ovchinnikov-Fulde-Ferrell state in centrosymmetric superconductors.
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