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A Possible Mechanism of the Pseudogap in Organic Superconductor Based on the Superconducting Fluctuation

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arxiv cond-mat/9908010 v1 pith:YRHGJTQI submitted 1999-08-01 cond-mat.supr-con cond-mat.str-el

classification cond-mat.supr-concond-mat.str-el
keywords fluctuationpseudogapsuperconductinganomalousapproximationaroundbedt-ttfbehavior
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abstract

The explanation of the anomalous behavior in $\kappa$-type (BEDT-TTF)$_2$X which was revealed by the nuclear magnetic resonance experiments is presented. We calculate the electronic properties by using the one-loop approximation for the superconducting fluctuation. The decrease of the density of states due to the large damping effect is obtained and the one-particle spectrum has a pseudogap structure around the Fermi level. It is found that these behaviors are peculiar to the quasi two-dimensional system and are enhanced in the incoherent metal. The similarity between the cuprates and this compounds is discussed and an experiment to check this proposal is suggested.

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