Mixed order parameter symmetries in cuprate superconductorsA. Bussmann-Holder1, R. Khasanov2, A. Shengelaya3, A. Maisuradze2, F. La Mattina2, H. Keller2 and K. A. Müller2
1 Max-Planck-Institut für Festkörperforschung - Heisenbergstrasse 1, D-70569 Stuttgart, Germany
2 Physik Institut der Universität Zürich - Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
3 Physics Institute of Tbilisi State University - Chavchadze 3, GE-0128 Tbilisi, Georgia
received 17 August 2006; accepted in final form 16 November 2006; published January 2007
published online 5 January 2007
The recent observation of an inflection point in the temperature dependence of the in-plane magnetic field dependence is investigated within a two-band model with coupled order parameters of different symmetries. While the dominant order parameter has d-wave symmetry, the smaller one is of s-wave symmetry. Superconductivity is robust in the d-wave channel and induced via interband interactions in the s-wave subsystem.
74.20.-z - Theories and models of superconducting state .
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds).
74.20.Rp - Pairing symmetries (other than s-wave) .
© Europhysics Letters Association 2007