Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 14: Postersitzung III (Neue u. unkonventionelle Supraleiter, Anwendungen der Supraleitung, Dünne Schichten, JJs und SQUIDs, Schwere Fermionen, Kondo-Systeme)

TT 14.7: Poster

Mittwoch, 26. März 2003, 14:30–19:00, P2c

Sufrace Impedance of Low Dimensional Superconductors — •Jürgen Thoms and Martin Dressel — 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart

The temperature dependent complex surface impedance Z_S of low dimensional superconductors was measured with a cavity perturbation technique at 35 GHz in a ³He-cryostat. For temperatures well below the transition temperature T_C the imaginary part of the surface impedance, the surface reactance X_S, is proportional to the penetration depth λ. Therefore it can be directly compared with various models of the superconducting state. Furthermore, the complex conductivity can be evaluated.

Both Sr₂RuO₄ and (TMTSF)₂ClO₄ are prime candidates for triplet superconductivity. Measurements in the normal and superconducting state on these materials and on κ−(ET)₂I₃, κ−(ET)₂Cu[N(CN)₂]Br are presented and compared with different models.