Common microscopic origin of superconductivity and unusual temperature dependence of the dc electrical conductivity in strongly correlated organic donor--acceptor salts

Journal Article · Sun Dec 15 00:00:00 EST 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461159· OSTI ID:6132243

Boehm, M C ^[1]

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1. Institut fuer Physikalische Chemie, Physikalische Chemie III, Technische Hochschule Darmstadt, D-6100 Darmstadt (Germany)

Material properties of low-dimensional organic donor--acceptor (DA) metals are comparatively discussed. It is shown that the low-temperature superconductivity in organic solids and the nonconventional temperature dependence of the dc electrical conductivity {sigma} have the same microscopic precursor, softening of lattice modes caused by a divergence of the generalized susceptibility on effectively flat Fermi surfaces (FS) ({ital T} dependence of {sigma}), as well as the resulting enhancement of the electron--phonon coupling (superconductivity). Prerequisite for this behavior are sizeable electronic charge fluctuations {l angle}({Delta}{ital n}{sup 2}{sub {ital i}}){r angle} in the strongly correlated organic DA salts at any temperature. Nonvanishing fluctuations, which are maintained also in the limit of almost perfect interatomic correlations, are possible as a result of nonintegral effective electron densities {ital {bar n}}{sub {ital i}}{ne}1.0. The electronic charge fluctuations at {ital T}=0 K and finite temperature are studied by an analytic many-body model. The {ital T} dependence of the fluctuations is discussed as a function of the accessible electron density {ital {bar n}}{sub {ital i}}.

• OSTI ID: 6132243
• Journal Information: Journal of Chemical Physics; (United States), Vol. 95:12; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEDT-TTF
FLUCTUATIONS
SUPERCONDUCTIVITY
TMTSF
ABSOLUTE ZERO TEMPERATURE
ANALYTICAL SOLUTION
CHARGE EXCHANGE
CHLORATES
COMPARATIVE EVALUATIONS
ELECTRIC CHARGES
ELECTRIC CONDUCTIVITY
ELECTRON DENSITY
ELECTRON PAIRS
ELECTRON-PHONON COUPLING
FERMI LEVEL
HIGH TEMPERATURE
MANY-BODY PROBLEM
METALS
ONE-DIMENSIONAL CALCULATIONS
RENORMALIZATION
SALTS
STOICHIOMETRY
TEMPERATURE CONTROL
TEMPERATURE DEPENDENCE
CHLORINE COMPOUNDS
CONTROL
COUPLING
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY LEVELS
EVALUATION
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
ORGANIC SUPERCONDUCTORS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SELENIUM COMPOUNDS
SUPERCONDUCTORS
VARIATIONS
665411* - Basic Superconductivity Studies- (1992-)