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The Role of the Electron‐Hole System in the Thermodynamics of YBa 2 Cu 3 O 7−δ Gas Equilibrium
Author(s) -
Tsidilkovskii V. I.,
Leonidov I. A.,
Lakhtin A. A.,
Mezrin V. A.
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221680122
Subject(s) - oxygen , ion , oxide , electron , thermodynamics , equilibrium thermodynamics , electron hole , basal plane , valence (chemistry) , chemistry , thermodynamic equilibrium , condensed matter physics , atomic physics , physics , quantum mechanics , organic chemistry
Abstract The YBa 2 Cu 3 O 7−δ ‐gas equilibrium is studied theoretically in terms of the approach proposed earlier by the authors. The contribution of the electron‐hole system of the HTSC oxide to the equilibrium thermodynamics is studied for several models of the electronic structure. Oxygen—oxygen interactions in the basal plane are taken into account to calculate the chemical potential of oxygen ions in the oxide, distinct from the previous paper where these interactions are disregarded. It is shown that the equilibrium is well described for a sufficiently broad (much broader than kT ) valence band with a hole effective mass m p ≈ 3 to 5 free electron masses.