Coherence length and vortex filament in the boson-fermion model of superconductivity.
Coherence length and vortex filament in the boson-fermion model of superconductivity.
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DOI：
10.1103/physrevb.42.4122
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发表时间：
1990-09
期刊：
影响因子：
--
通讯作者：
R. Friedberg;T. D. Lee;H. Ren
中科院分区：
文献类型：
--
作者：
R. Friedberg;T. D. Lee;H. Ren
The boson-fermion model of high-{Tc} superconductivity is based on the dominance of the {ital s}-channel'' reaction 2{ital e}{r arrow}{phi}{r arrow}2{ital e}, where {phi} is a local field, representing phenomenologically the pair state. We show that in this model the coherence length {xi} can be calculated and is very small, consistent with observation. This, in turn, justifies the local-field approximation. The relevance of Bose-Einstein condensation is discussed; in this theory, the critical temperature can be much higher than that in the BCS theory. We also examine the vortex filament and the critical magnetic fields {ital H}{sub {ital c}1} and {ital H}{sub {ital c}2}.
