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

doi:10.1103/PhysRevB.43.8690

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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

DOI 10.1103/PhysRevB.43.8690 · Physical Review B

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Abstract

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 Tc’s 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	50	Pressure not reported	unknown
YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60	Pressure not reported	unknown
YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	unknown
(La0.85Sr0.15)CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown
YBa2Cu3O6.51 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	47	Pressure not reported	unknown
YBa2Cu3O6.69 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	59	Pressure not reported	unknown