Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Superconductivity: (General) Theory 2

TT 99.11: Vortrag

Donnerstag, 19. März 2015, 17:45–18:00, H 2053

Superconductivity of heavy fermions in the Kondo lattice model — •Steffen Sykora¹ and Klaus W. Becker² — ¹IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — ²Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany

Understanding of the origin of superconductivity in strongly correlated electron systems is one of the basic unresolved problems in physics. Examples for such systems are the cuprates and also the heavy-fermion metals, which are compounds with 4f and 5f electrons. In all these materials the superconducting pairing interaction is often believed to be predominantly mediated by spin fluctuations and not by phonons as in normal metals. For the Kondo-lattice model we present results, which are derived within the Projective Renormalization Method (PRM). Based on a recent study of the one-particle spectral function for the normal state we first derive an effective Hamiltonian which describes heavy fermion quasiparticle bands close to the Fermi surface. An extension to the superconducting phase leads to d-wave solutions for the superconducting order parameter in agreement with recent STM measurements.