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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2002     Display Documents



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ID: 7036.0, MPI für Festkörperforschung / FKF Publikationen 2002
Charge ordering and superconductivity in α-(BEDT-TTF)2MHg(SCN)4
Authors:Dressel, M.; Drichko, N.; Salameh, B.; Thoms, J.; Schlueter, J.; Merino, J.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Journal de Physique IV
Volume:12
Issue / Number:PR9
Start Page:57
End Page:60
Review Status:Peer-review
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Univ Stuttgart, Inst Phys 1, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
; AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
; Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
; Max Planck Inst Festkorperforsch, D-70506 Stuttgart, Germany
Identifiers:ISI:000180633200014
ISSN:1155-4339
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