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TT: Fachverband Tiefe Temperaturen

TT 10: Superconductivity - Properties, Electronic Structure, Order Parameter

TT 10.11: Vortrag

Dienstag, 27. März 2007, 12:15–12:30, H18

Magnetic field dependence of the superconducting gap node topology in non-centrosymmetric CePt₃Si — •Ilya Eremin^1,2 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.