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Role of the oxygen content in TlBa 1.2 La 0.8 CuO 5 + δ superconductors
Author(s) -
Ming Li
Publication year - 1996
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/(sici)1097-461x(1996)60:5<1057::aid-qua12>3.0.co;2-4
Subject(s) - doping , oxygen , superconductivity , fermi level , condensed matter physics , electronic band structure , content (measure theory) , electronic structure , chemistry , materials science , analytical chemistry (journal) , physics , electron , mathematical analysis , mathematics , organic chemistry , chromatography , quantum mechanics
The electronic energy band structures of the La‐doped superconductors TlBa 1.2 La 0.8 CuO 5 + δ were calculated. The effect of the oxygen content on their electronic structures was studied. The results show that compared with those for TlBa 2 CuO 5 , the La doping at the Ba site results in the moderate change in the band structures and the decrease in the densities of states, but the increase in the oxygen content caused by the La doping results in the great change in the band structures and the densities of states near the Fermi surface. The low oxygen content causes the degree of complexity of the band structures and the densities of states near the Fermi level E f to increase and the high oxygen content causes them to decrease. The oxygen content plays a dominant role in TlBa 1.2 La 0.8 CuO 5 + δ . In addition, the Cu‐O planes are most sensitive to the increase in the oxygen content. © 1996 John Wiley & Sons, Inc.