https://doi.org/10.1140/epjb/e2009-00141-4
Energy structure of high-temperature superconductors with the intersite Coulomb interaction
1
L.V. Kirensky Institute of Physics, Siberian Branch of
RAS, 660036 Krasnoyarsk, Russia
2
Siberian Federal University, 660041 Krasnoyarsk, Russia
Corresponding author: a vvv@iph.krasn.ru
Received:
19
June
2008
Revised:
17
February
2009
Published online:
22
April
2009
The effect of the intersite Coulomb interaction of fermions on the ground state and energy structure of high-temperature superconductors is considered within the three-band Emery model using an extended basis of the irreducible operators orthogonal on Mori. The proposed theory allows prediction of bands of the fluctuation states whose spectral intensity grows with an increase in the root-mean-square fluctuations of the occupation numbers. The increase in these fluctuations in high-temperature superconductors upon doping plays a key role in redistribution of the integrated density of the Fermi states.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 74.72.-h – Cuprate superconductors / 71.28.+d – Narrow-band systems; intermediate-valence solids
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009
