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Microwave fluctuational conductivity in YBa\(\mathsf{_{2}}\)Cu\(\mathsf{_{3}}\)O \(\mathsf{_{7-\delta}}\)

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Abstract

We present measurements of the microwave complex conductivity at 23.9 and 48.2 GHz in YBa2Cu3O\(_{7-\delta}\) films, in the fluctuational region above T c . With increasing temperature, the fluctuational excess conductivity drops much faster than the well-known calculations within the time-dependent Ginzburg-Landau theory [H. Schmidt, Z. Phys. 216, 336 (1968)]. Approaching the transition temperature, slowing down of the fluctuations is observed. We discuss the results in terms of a modified Gaussian theory for finite-frequency fluctuational conductivity, where renormalization is introduced in order to account for the \(T\rightarrow T_{c}\) regime, and a spectral cutoff is inserted in order to discard high-momentum modes. The data are in excellent agreement with the modified theory, when formulated for three-dimensional, anisotropic superconductors, in the whole experimentally accessible temperature range, and for both frequencies.

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Authors and Affiliations

  1. Dipartimento di Fisica “E. Amaldi” and Unitá INFM, Universitá “Roma Tre”, Via della Vasca Navale 84, 00146, Roma, Italy

    E. Silva & R. Marcon

  2. Dipartimento di Fisica and Unitá INFM, Universitá “La Sapienza”, P.le Aldo Moro 2, 00185, Roma, Italy

    S. Sarti, R. Fastampa & M. Giura

  3. Dipartimento di Fisica, Universitá di Salerno, Baronissi, Salerno, Italy

    M. Boffa & A. M. Cucolo

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  1. E. Silva
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Correspondence to E. Silva.

Additional information

Received: 23 December 2003, Published online: 2 April 2004

PACS:

74.25.Nf Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) - 74.40. + k Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) - 74.72.Bk Y-based cuprates

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Silva, E., Marcon, R., Sarti, S. et al. Microwave fluctuational conductivity in YBa\(\mathsf{_{2}}\)Cu\(\mathsf{_{3}}\)O \(\mathsf{_{7-\delta}}\) . Eur. Phys. J. B 37, 277–284 (2004). https://doi.org/10.1140/epjb/e2004-00057-5

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