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Hamburg 2001 – scientific programme

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TT: Tiefe Temperaturen

TT 5: Fachsymposium 1: Unkonventionelle Supraleitung

TT 5.6: Talk

Monday, March 26, 2001, 16:30–16:45, A

LONGITUDINAL AND TRANSVERSE JOSEPHSON PLASMA MODES IN HIGH-Tc SUPERCONDUCTORS — •B. Gorshunov1, M. Dressel1, T. Kakeshita2, K.M. Kojima2, S. Uchida2, S. Adachi3, and S. Tajima311.Physikalisches Institut, Universität Stuttgart, Germany — 2Department of Superconductivity, University of Tokyo, Japan — 3Superconductivity Research Laboratory, ISTEC, Tokyo, Japan

Longitudinal and transverse Josephson plasma modes are studied in high-temperature superconductors by optical spectroscopy. For the first time a transverse optical mode is observed in single crystals of T* cuprate superconductors SmLa0.85Sr0.15CuO4−δ and Nd1.4Sr0.4Ce0.2CuO4−δ which have two different insulating layers sandwiching the superconducting copper-oxygen planes thus forming an alternating array of two inequivalent Josephson junctions. Characteristics of the plasma excitations, like spectral weights and frequency positions, are analyzed based on the existing models.

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