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Phys. Rev. B 57, R11077 - R11080 (1998)

Evidence for magnetic pseudoscaling in overdoped La2-xSrxCuO4

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J. G. Naeini, X. K. Chen, K. C. Hewitt, and J. C. Irwin
Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada

T. P. Devereaux
Department of Physics, George Washington University, Washington, D.C. 20052

M. Okuya *, T. Kimura †, and K. Kishio
Department of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

Rapid Communication Received 20 November 1997

We report the results of electronic Raman-scattering experiments on an overdoped La1.78Sr0.22CuO4 single crystal as a function of temperature. The scattering rate Γ(Ω→0,T) has been determined from the normal state B1g spectra in the range 50<~T<~300 K. Γ(T) decreases linearly from 300 K to about 175 K and then undergoes a reduction with respect to the expected mean-field behavior. This trend suggests a crossover to a magnetic pseudoscaling regime at Tcr≃160 K. The results are in good agreement with the prediction of the nearly antiferromagnetic Fermi-liquid model. There is no evidence of a pseudogap in the spectra obtained from this overdoped sample.


©1998 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.57.R11077
DOI: 10.1103/PhysRevB.57.R11077
PACS: 74.25.Gz, 74.72.Dn, 78.30.Er

* Present address: Department of Material Science, Shizuoka University, Johoku, Hamamatsu 432, Japan.
† Present address: Joint Research Center for Atom Technology, Higashi, Tsukuba 305, Japan.

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