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TT: Fachverband Tiefe Temperaturen
TT 10: Superconductivity - Properties, Electronic Structure, Order Parameter
TT 10.11: Talk
Tuesday, March 27, 2007, 12:15–12:30, H18
Magnetic field dependence of the superconducting gap node topology in non-centrosymmetric CePt3Si — •Ilya Eremin1,2 and James Annett3 — 1Max-Planck-Institut für Physik Komplexer Systeme,D-01187, Dresden, Germany — 2Institute für Mathematische und Theoretische Physik, Technische Universität Carlo-Wilhelmina zu Braunschweig, 38106 Braunschweig, Germany — 3H.H. Wills Physics Laboratory, University of Bristol, Tyndall
Non-centrosymmetric superconductors, such as CePt3Si and Li2PtB2, are believed to have a line node in the energy gap arising from coexistence of s-wave and p-wave pairing. Using as an example CePt3Si we show that a weak c-axis magnetic field will remove this line node, since it has no topological stability against time-reversal symmetry breaking perturbations. Conversely a field in the a−b plane is shown to remove the line node on some regions of the Fermi surface, while bifurcating the line node in other directions, resulting in two ’boomerang’-like shapes. These line node topological changes are predicted to be observable experimentally in the low temperature heat capacity.