Thermodynamics and tunneling spectroscopy in the pseudogap regime of the boson fermion model

Details Thermodynamics and tunneling spectroscopy in the pseudogap regime of the boson fermion model Thermodynamics and tunneling spectroscopy in the pseudogap regime of the boson fermion model

2002-08-13

arxiv.org/abs/cond-mat/0208255v1

Physica C 387, 77 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures. submitted to Physica C

Scientific paper

10.1016/S0921-4534(03)00645-2

Motivated by the STM experimental data on Bi_2 Sr_2 CaCU_2 O_{8+x} which indicate the tunneling conductance asymmetry sigma(-V) not equal sigma(V), we report that such a behavior can be explained in terms of the boson fermion model. It has been shown in the recent studies, based on various selfconsistent techniques to capture the many-body effects, that the low energy spectrum of the boson fermion model is featured by an appearance of the pseudogap at T^* > T_c. We argue that the pseudogap structure has to exhibit a particle-hole asymmetry. This asymmetry may eventually depend on the boson concentration.

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