Magnetic excitations in overdoped La2-xSrxCuO4

被引：1
作者：
Wakimoto, S.
Yamada, K. [1 ]
Tranquada, J. M.
Frost, C. D.
Swainson, I.
Birgeneau, R. J.
机构：
[1] Japan Atom Energy Agcy, Tokai, Ibaraki 3191195, Japan
[2] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan
[3] Condensed Matter Phys & Mat Sci Dept, Brookhaven Natl Lab, Upton, NY 11973 USA
[4] Rutherford Appleton Lab, JSIS Facil, Didcot OX11 0QX, Oxon, England
[5] CNR, Chalk River, ON K0J 1J0, Canada
[6] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2007年 / 460卷
关键词：
high-T-c superconductivity; LSCO; spin excitation; neutron scattering; TRANSITION-TEMPERATURE; PHASE-SEPARATION; STRIPES;
D O I：
10.1016/j.physc.2007.03.306
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Spin excitations of overcloped La2-xSrxCuO4 (0.25 <= x <= 0.30) have been studied by neutron scattering utilizing triple-axis and time-of-flight spectrometers. Low-energy excitation spectra (omega <= 10 meV) for all of the superconducting samples show a maximum around omega = 6 meV with a maximum value of dynamic spin susceptibility chi ''(omega) that decreases linearly with T-c as doping increases. The magnetic scattering cross section finally disappears at x = 0.30, coincident with the disappearance of bulk superconductivity. Time-of-flight measurements for x = 0.25 and 0.30 show markedly suppressed magnetic scattering intensities at intermediate energies (20 <= omega <= 80 meV) in contrast to those of the stripe-ordered La1.875Ba0.125CuO4, which shows large spectral weight near the saddle point of the "hour-glass" shape dispersion. These facts imply a cooperative correlation between the dynamic incommensurate state and the superconductivity. (c) 2007 Elsevier B.V. All rights reserved.
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页码：166 / 169
页数：4
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