Spectral shift of the magnetic cross section in superconducting YBa2Cu3O6+x

P. Bourges, P. M. Gehring, B. Hennion, A. H. Moudden, J. M. Tranquada, G. Shirane, S. Shamoto, M. Sato

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A triple-axis neutron-scattering study has been done of the magnetic correlations in three large single crystals of YBa2Cu3O6+x with x=0.5, 0.8, and 0.9 having Tcs of 50, 60, and 80 K, respectively. The frequency dependence of the cross section at Q=(1/2,1/2,l) was found to peak near 5 meV for x=0.45 in an earlier study. Our data confirm that this peak shifts to 30 meV for x=0.5. Moreover, the low-frequency (<40 meV) spectra for x=0.8 and 0.9 become progressively suppressed with respect to those of the less oxygenated samples. These data are consistent with a picture in which the spectral weight of the magnetic scattering shifts to higher energy as the oxygen concentration x and carrier density increase.

頁(從 - 到)8690-8693
期刊Physical Review B
出版狀態Published - 1991

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學


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