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Abstract:
The ab-plane surface impedance of Tl2Ba2CuO6+δ (Tl-2201) has been measured at 14.4, 24.8 and 35.9 GHz using cavity perturbation techniques. The result of these measurements is a picture of the superconducting electrodynamics of Tl-2201 that closely resembles those of YBa2Cu3O7−δ and Bi2Sr2CaCu2O8. Here we describe the main features of our measurements; in particular, we see a linear temperature dependence of the in-plane penetration depth at low temperature, consistent with an unconventional pairing state with line nodes. The simple crystal structure of Tl-2201 (tetragonal, with a single CuO2 plane/unit cell) makes this an interesting addition to our knowledge of cuprate electrodynamics.
