Out-of-plane superfluid density of a layered organic superconductor : The coherent Josephson tunneling

S. Tomić; M. Pinterić; K. Maki; M. Prester; Ð. Drobac; O. Milat; D. Schweitzer; I. Heinen; W. Strunz

doi:doi:10.1051/jp4:19991079

International Workshop on Electronic Crystals
ECRYS-99

J. Phys. IV France 09 (1999) Pr10-301-Pr10-303
DOI: 10.1051/jp4:19991079

Out-of-plane superfluid density of a layered organic superconductor : The coherent Josephson tunneling

S. Tomic¹, M. Pinteric^{1, 2}, K. Maki³, M. Prester¹, Ð. Drobac¹, O. Milat¹, D. Schweitzer⁴, I. Heinen⁵ and W. Strunz⁵

¹ Institute of Physics, Zagreb, Croatia
² Faculty of Civil Engineering, University of Maribor, Maribor, Slovenia
³ Department of Physics and Astronomy, USC, Los Angeles, U.S.A.
⁴ 3. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany
⁵ Anorganisch-Chemiches Institut, Universität Heidelberg, Heidelberg, Germany

Abstract
Measurements of AC magnetic susceptibility in k-(BEDT-TTF)₂Cu[N(CN)₂Br] show that the b-axis penetration depth below T_c exhibits behaviour different from that observed in the ac plane, which exhibits the T-linear dependence. In agreement with earlier measurements, a leading quadratic temperature dependence is found at low temperatures. The temperature dependence of the out-of plane superfluid density is shown to best agree with a model of d-wave superconducting layers coupled by coherent Josephson tunneling.