ISSN:
1434-6036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract From temperature-dependent X-ray photoemission (XPS) spectra between 300 and 10 K of Sr doped La2CuO4 and “123” compounds (YBa2Cu3O7−δ) we deduce the absence of the Cu3d 8(Cu3+) configuration in the ground state of these Mott insulators. The metallic character of these samples and involving those Cu atoms which are relevant for the superconducting properties arises from α(d 9 p 6)+β(d 10 p 5) valence fluctuations, while the superconducting transition is indicated to be closely related to an incipient oxygen dimerization which is best detected upon cooling far belowT c .
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01318290