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26 April 2024 |
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Competition between Charge Ordering and Superconductivity in Layered Organic Conductors $alpha$-(BEDT-TTF)$_2M$Hg(SCN)$_4$ (M = K, NH$_4$) | | M. Dressel
; N. Drichko
; J. Schlueter
; J. Merino
; | | Date: |
6 Jun 2002 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Abstract: | While the optical properties of the superconducting salt $alpha$-(BEDT-TTF)$_2$NH$_4$Hg(SCN)$_4$ remain metallic down to 2 K, in the non-superconducting K-analog a pseudogap develops at frequencies of about 200 cm$^{-1}$ for temperatures T < 200 K. Based on exact diagonalisation calculations on an extended Hubbard model at quarter-filling we argue that fluctuations associated with short range charge ordering are responsible for the observed low-frequency feature. The different ground states, including superconductivity, are a consequence of the proximity of these compounds to a quantum phase charge-ordering transition driven by the intermolecular Coulomb repulsion. | | Source: | arXiv, cond-mat/0206074 | | Services: | Forum | Review | PDF | Favorites | |
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