Mott transition in cuprate high-temperature superconductors

In this study, we investigate the metal-insulator transition of charge transfer type in high-temperature cuprates. We first show that we must introduce a new band parameter in the three-band model to reproduce the Fermi surface of high-temperature cuprates such as BSCCO, YBCO and Hg1201. We present...

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Bibliographic Details
Published in:Europhysics letters 2014-07, Vol.107 (2), p.27004-p1-27004-p6
Main Authors: Yanagisawa, Takashi, Miyazaki, Mitake
Format: Article
Language:English
Subjects:
71.10.-w
71.27.+a
Asymptotic properties
Bismuth strontium calcium copper oxide
Charge transfer
COPPER OXIDE
Cuprates
Fermi surfaces
High temperature superconductors
Insulators
MATHEMATICAL ANALYSIS
Mathematical models
Metal-insulator transition
Monte Carlo simulation
Parameters
PROPERTIES
SUPERCONDUCTORS
Wave functions
YBCO superconductors
YTTRIUM OXIDE
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Summary:In this study, we investigate the metal-insulator transition of charge transfer type in high-temperature cuprates. We first show that we must introduce a new band parameter in the three-band model to reproduce the Fermi surface of high-temperature cuprates such as BSCCO, YBCO and Hg1201. We present a new wave function of a Mott insulator based on the improved Gutzwiller function, and show that there is a transition from a metal to a charge-transfer insulator for such parameters by using the variational Monte Carlo method. This transition occurs when the level difference between d and p orbitals reaches a critical value . The energy gain , measured from the limit of large , is proportional to for : . We obtain using the realistic band parameters.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/107/27004