The low temperature microwave properties of GdBa2Cu3O7-δ and Sr2RuO4

C. E. Gough, R. J. Ormeno, M. A. Hein, A. Sibley, J. J. Wingfield, J. Powell, A. Porch, G. Yang, Y. Maeno, Zhiqiang Mao

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Abstract

Measurements of the microwave surface resistance Rs and reactance Xs of GdBa2Cu3O7-δ and Sr2RuO4 single crystals are reported in the temperature range 0.4 to 25 K at frequencies from 10 to 20 GHz, using a hollow dielectric resonator technique. The GdBa2Cu3O7-δ measurements are interpreted in terms of antiferromagnetic alignment of the Gd spins, resulting in a Nèel transition at 2.25 K, with a strongly temperature spin relaxation time both above and below the transition. Above Tc = 1.45 K, the normal state surface impedance of the suspected p-wave superconductor Sr2RuO4 agrees rather well with that expected from dc measurements; however, below Tc, we observe an unusual increase in the surface reactance, which we attribute to a long electron relaxation time. Using a two-fluid model, we obtain a normal fluid component that decreases almost linearly with temperature and extrapolates to a finite low-temperature value.

Original languageEnglish (US)
Pages (from-to)73-79
Number of pages7
JournalJournal of Superconductivity and Novel Magnetism
Volume14
Issue number1
StatePublished - Dec 1 1996

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Gough, C. E., Ormeno, R. J., Hein, M. A., Sibley, A., Wingfield, J. J., Powell, J., Porch, A., Yang, G., Maeno, Y., & Mao, Z. (1996). The low temperature microwave properties of GdBa2Cu3O7-δ and Sr2RuO4. Journal of Superconductivity and Novel Magnetism, 14(1), 73-79.