Microwave surface impedance measurements of Sr2 RuO4

The effect of impurities

P. J. Baker, R. J. Ormeno, C. E. Gough, Zhiqiang Mao, S. Nishizaki, Y. Maeno

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The temperature, purity, and frequency dependence of the real and imaginary components of the complex surface impedance of three single crystals of the proposed p -wave superconductor Sr2 RuO4, with Tc values of 1.40, 1.24, and 0.74 K, have been measured over a range of microwave frequencies from 4-16 GHz down to 100 mK. The unusual superconducting microwave properties can be described by a multiband, two-fluid model consistent with electron relaxation times remaining largely unchanged on entering the superconducting state and energy gaps on all bands having the same temperature dependence. In addition, the model is consistent with nonmagnetic impurity scattering strongly suppressing the superconducting fractions leading to large residual losses at low temperatures and an increase in penetration depth. Model independent derivations of the complex microwave conductivity are shown to be largely consistent with such a scenario.

Original languageEnglish (US)
Article number115126
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number11
DOIs
StatePublished - Sep 29 2009

Fingerprint

impedance measurement
Microwaves
Impurities
microwaves
impurities
temperature dependence
two fluid models
microwave frequencies
purity
derivation
penetration
relaxation time
Microwave frequencies
impedance
Relaxation time
conductivity
Temperature
Superconducting materials
single crystals
Energy gap

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Baker, P. J. ; Ormeno, R. J. ; Gough, C. E. ; Mao, Zhiqiang ; Nishizaki, S. ; Maeno, Y. / Microwave surface impedance measurements of Sr2 RuO4 : The effect of impurities. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 80, No. 11.
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Microwave surface impedance measurements of Sr2 RuO4 : The effect of impurities. / Baker, P. J.; Ormeno, R. J.; Gough, C. E.; Mao, Zhiqiang; Nishizaki, S.; Maeno, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 11, 115126, 29.09.2009.

Research output: Contribution to journalArticle

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T2 - The effect of impurities

AU - Baker, P. J.

AU - Ormeno, R. J.

AU - Gough, C. E.

AU - Mao, Zhiqiang

AU - Nishizaki, S.

AU - Maeno, Y.

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AB - The temperature, purity, and frequency dependence of the real and imaginary components of the complex surface impedance of three single crystals of the proposed p -wave superconductor Sr2 RuO4, with Tc values of 1.40, 1.24, and 0.74 K, have been measured over a range of microwave frequencies from 4-16 GHz down to 100 mK. The unusual superconducting microwave properties can be described by a multiband, two-fluid model consistent with electron relaxation times remaining largely unchanged on entering the superconducting state and energy gaps on all bands having the same temperature dependence. In addition, the model is consistent with nonmagnetic impurity scattering strongly suppressing the superconducting fractions leading to large residual losses at low temperatures and an increase in penetration depth. Model independent derivations of the complex microwave conductivity are shown to be largely consistent with such a scenario.

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