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A Structural Probe of the Doped Holes in Cuprate Superconductors | | P. Abbamonte
; L. Venema
; A. Rusydi
; G. A. Sawatzky
; G. Logvenov
; I. Bozovic
; | | Date: |
14 Aug 2002 | | Journal: | Science, vol. 297, p. 581 (26 July 2002) | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | An unresolved issue concerning cuprate superconductors is whether the distribution of carriers in the CuO(2) plane is uniform or inhomogeneous. Because the carriers comprise a small fraction of the total charge density and may be rapidly fluctuating, modulations are difficult to detect directly. Here we demonstrate that in anomalous x-ray scattering at the oxygen K edge of the cuprates, the contribution of carriers to the scattering amplitude is selectively magnified 82 times. This enhances diffraction from the doped holes by more than 10^3, permitting direct structural analysis of the superconducting ground state. Scattering from thin films of La(2)CuO(4+x) (Tc = 39 K) at T=(50 +/- 5) K on the reciprocal space intervals (0,0,0.21) -> (0,0,1.21) and (0,0,0.6) -> (0.3,0,0.6) show a rounding of the carrier density near the substrate suggestive of a depletion zone or similar effect. The structure factor for off-specular scattering was less than 3x10-7 e, suggesting an absence of in-plane hole ordering in this material. | | Source: | arXiv, cond-mat/0208289 | | Other source: | [GID 772051] pmid12142531 | | Services: | Forum | Review | PDF | Favorites | |
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