Microwave determination of the quasiparticle scattering time in YBa2Cu3O6.95

Bonn, D. A., Liang, R., Riseman, T. M., Baar, D. J., Morgan, D. C, Zhang, K., Dosanjh, P., Duty, T., MacFarlane, A., G. D. Morris,, Brewer, J. H., Hardy, W. N., Kallin, C. and Berlinsky, A. J. (1993) Microwave determination of the quasiparticle scattering time in YBa2Cu3O6.95. Physical Review B, 47 17: 11314-11328. doi:10.1103/PhysRevB.47.11314

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Author Bonn, D. A.
Liang, R.
Riseman, T. M.
Baar, D. J.
Morgan, D. C
Zhang, K.
Dosanjh, P.
Duty, T.
MacFarlane, A.
G. D. Morris,
Brewer, J. H.
Hardy, W. N.
Kallin, C.
Berlinsky, A. J.
Title Microwave determination of the quasiparticle scattering time in YBa2Cu3O6.95
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
1550-235X
Publication date 1993
Sub-type Article (original research)
DOI 10.1103/PhysRevB.47.11314
Open Access Status File (Publisher version)
Volume 47
Issue 17
Start page 11314
End page 11328
Total pages 15
Editor Adams, P. D.
Begley, A. M.
Place of publication Ridge, New York
Publisher The American Physical Society
Collection year 1993
Language eng
Subject 240000 Physical Sciences
Abstract We report microwave surface resistance (Rs) measurements on two very-high-quality YBa2Cu3O6.95 crystals which exhibit extremely low residual loss at 1.2 K (2-6 μΩ at 2 GHz), a broad, reproducible peak at around 38 K, and a rapid increase in loss, by 4 orders of magnitude, between 80 and 93 K. These data provide one ingredient in the determination of the temperature dependence of the real part of the microwave conductivity, σ1(T), and of the quasiparticle scattering time. The other necessary ingredient is an accurate knowledge of the magnitude and temperature dependence of the London penetration depth, λ(T). This is derived from published data, from microwave data of Anlage, Langley, and co-workers and from, high-quality μSR data. We infer, from a careful analysis of all available data, that λ2(0)/λ2(T) is well approximated by the simple function 1-t2, where t=T/Tc, and that the low-temperature data are incompatible with the existence of an s-wave, BCS-like gap. Combining the Rs and λ(T) data, we find that σ1(T), has a broad peak around 32 K with a value about 20 times that at Tc. Using a generalized two-fluid model, we extract the temperature dependence of the quasiparticle scattering rate which follows an exponential law, exp(T/T0), where T0≊12 K, for T between 15 and 84 K. Such a temperature dependence has previously been observed in measurements of the nuclear spin-lattice relaxation rate. Both the uncertainties in our analysis and the implications for the mechanism of high-temperature superconductivity are discussed.
Keyword microwave surface resistance (Rs)
YBa2Cu3O6.95 crystals
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Wed, 06 Aug 2008, 13:59:26 EST by Thelma Whitbourne on behalf of School of Mathematics & Physics