title: Strong surface contribution to the nonlinear Meissner effect in d-wave superconductors.
abstract: We demonstrate that in a d-wave superconductor the bulk nonlinear Meissner effect is dominated by a surface effect due to Andreev bound states at low temperatures. The contribution of this surface effect to the nonlinear response coefficient follows a 1/T3 law with the opposite sign compared to the bulk 1/T behavior. The crossover from bulk dominated behavior to surface dominated behavior occurs at a temperature of T/Tc∼1/square root(κ). We present an approximate analytical calculation, which supports our numerical calculations and provides a qualitative understanding of the effect. The effect can be probed by intermodulation distortion experiments.
authors.affiliation: Institut für Theoretische Physik and Center for Collective Quantum Phenomena, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Zare
authors.forename: T
authors.initials: T
authors.lastname: Dahm
authors.forename: N
authors.initials: N
authors.lastname: Schopohl