Doping dependence of the spatially modulated dynamical spin correlations and the superconducting-transition temperature in La2xSrxCuO4

K. Yamada, C. H. Lee, K. Kurahashi, J. Wada, S. Wakimoto, S. Ueki, H. Kimura, Y. Endoh, S. Hosoya, G. Shirane, R. J. Birgeneau, M. Greven, M. A. Kastner, and Y. J. Kim
Phys. Rev. B 57, 6165 – Published 1 March 1998
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Abstract

Systematic low-energy neutron-scattering studies have been performed on float-zone-grown single crystals of La2xSrxCuO4 with x extending from zero doping, x=0, to the overdoped, weakly superconducting regime, x=0.25. For x beyond a critical doping value of xc0.05 the low-energy spin-fluctuation peak position shifts from (12, 12) to (12±δ, 12), and (12, 12±δ); xc also represents the onset concentration for superconductivity. For 0.06<~x<~0.12 the incommensurability δ follows approximately the quantitative relation δ=x. However, beyond x0.12 the incommensurability tends to saturate around δ1/8. The superconducting-transition temperature Tc(x) for stoichiometric samples at a given doping scales linearly with δ up to the optimal doping value of x. The peak momentum width of the spin fluctuations at low energies is small throughout the superconducting concentration region except in the strongly overdoped region. An anomalously small width is observed for x=18. The incommensurate spatial modulation is found to be robust with respect to pair-breaking effects that lower Tc, such as deoxygenation of the sample or replacement of Cu by Zn.

  • Received 8 September 1997

DOI:https://doi.org/10.1103/PhysRevB.57.6165

©1998 American Physical Society

Authors & Affiliations

K. Yamada, C. H. Lee, K. Kurahashi, J. Wada, S. Wakimoto, S. Ueki, H. Kimura, and Y. Endoh

  • Department of Physics, Tohoku University, Aramaki Aoba, Sendai 980-77, Japan

S. Hosoya

  • Institute of Inorganic Synthesis, Faculty of Engineering, Yamanashi University, Miyamae-cho 7, Kofu 400, Japan

G. Shirane

  • Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000

R. J. Birgeneau, M. Greven, M. A. Kastner, and Y. J. Kim

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

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Issue

Vol. 57, Iss. 10 — 1 March 1998

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