Charge ordering and superconductivity in α-(BEDT-TTF)2MHg(SCN)4

Dressel, M.; Drichko, N.; Salameh, B.; Thoms, J.; Schlueter, J.; Merino, J.

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Charge ordering and superconductivity in α-(BEDT-TTF)₂MHg(SCN)₄

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Merino, J.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Electronic Structure Theory (Ali Alavi), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Dressel, M., Drichko, N., Salameh, B., Thoms, J., Schlueter, J., & Merino, J. (2002). Charge ordering and superconductivity in α-(BEDT-TTF)₂MHg(SCN)₄. Journal de Physique IV, 12(PR9), 57-60.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F33B-E

Abstract

In the optical spectra of the non-superconducting salt alpha-
(BEDT-TTF)(2)KHg(SCN)(4) a strong feature appears at
frequencies of about 200 cm(-1) and temperatures below 200 K
which indicates the opening of a pseudogap. This is in contrast
to the superconducting alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4) which
exhibits metallic-like optical properties down to 2 K. Based on
exact diagonalisation calculations of the optical conductivity
on an extended Hubbard model at quarter-filling we argue that
the proximity of these salts to a charge ordering transition is
responsible for the observed pseudogap. Our proposed scenario
suggests that the different ground states, including
superconductivity, are a consequence of the fluctuations
associated with short range charge ordering which builds up
close to the quantum phase transition.