ISSN:
1572-9605
Keywords:
Electron-doped HTSC
;
infinite-layer compound
;
pholoelectron spectroscopy
;
Coulomb correlation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract We present investigations on the electronic structure of the recently discovered, electron-doped infinite-layer compound Sr1−xNdxCuO2−δ (T c≈40K) by means of photoelectron spectroscopy with synchrotron radiation. This system is compared with the two closely related cuprates Nd2−xCexCuO4−δ (electron doped) and Nd1.4Ce0.2Sr0.4CuO4−δ (hole doped). Valence band spectra in the Cu 3p→3d resonance are interpreted in terms of CuO4 (n-doped compounds) and CuO5 (p-doped system) cluster models. From our calculations we find a considerably higher Cu3d Coulomb correlation for the electron-doped compounds as well as a very low Cu-O hybridization for the infinite-layer system. Partial Nd spectra of Sr0.85Nd0.15CuO2−δ show the Nd dopants to be trivalent, thus confirming the infinite-layer compound to be electron doped. Analysis of partial Nd valence bands and magnetic susceptibilities of Nd2−xCexCuO4−δ and Nd1.4Ce0.2Sr0.4CuO4−δ gives very similar electronic parameters and antiferromagnetic correlations between Nd spins for both cuprates.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00724595
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