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The formation of negative-U centers in doped HTSC

✍ Scribed by O.M. Ivanenko; K.V. Mitsen

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
199 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

A mechanism for the influence of doping on the electron spectrum Nd2_xCexCuO 4 and Bal_xKxBiO 3 is proposed. In the framework of simple model taking into account the local nature of HTSC electronic properties the mechanism of formation of "negative-U centers" (with the pair orbital placed at the top of the oxygen subband) is consideredβ€’ The nature of interelectron attraction on oxygen -U-centers is the dependence of Cul+-state energy on the charge state of nearest O-atom. In tunas out that the energy of Cu 1 +-state for copper atom nearest to Oion is higher than one for copper atom nearest to 02-and O Β° ions.

Recently [1,2] we supposed that the

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Effective mass and specific heat in the
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The periodic Anderson model with negative correlation energy ( -Cl, U>O) has been used to investigate the effective mass and the electronic specific heat in the normal state. The mean occupation number of the local electrons has been treated in a selfconsistent method. Numerical calculation shows th