Near-infrared absorption of YBa2Cu3O7−δ: Evidence for Bose-Einstein condensation of small bipolarons
作者： A.S. Alexandrov , A.M. Bratkovsky , N.F. Mott , E.K.H. Salje
DOI: 10.1016/0921-4534(93)90236-J
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摘要: Abstract A significant change with temperature in intensity of the optical absorption spectrum YBa 2 Cu 3 O 7−δ range 2000 to 10000 cm −1 at superconducting transition is shown be a manifestation Bose-Einstein condensation small bipolarons. The sum rule for bipolaronic infrared derived and applied explanation this unusual effect on basis polaron theory high- T c superconductivity. dependence normal state controlled by thermal excitation singlet inter-site bipolarons into triplet states. As determined from experiments singlet-triplet exchange energy has same value as spin gap discovered Rossat Mignod et al. neutron scattering.
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