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(TMTSF) 2 (2,5‐DBr‐DCNQI) — A Novel Kind of CT‐Complex Electrical and Magnetic Properties Originating from Different Stacks
Author(s) -
Söderholm S.,
Von Schütz J. U.,
Schaumburg G.,
Helberg H. W.,
Erk P.,
Hünig S.
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221660219
Subject(s) - condensed matter physics , dielectric , spins , laser linewidth , chemistry , electrical resistivity and conductivity , spin (aerodynamics) , charge carrier , exchange interaction , materials science , ferromagnetism , physics , laser , optoelectronics , quantum mechanics , optics , thermodynamics
Electric and magnetic properties of the new charge‐transfer complex (TMTSF) 2 (2,5‐DBr‐DCNQI) are reported. The microwave conductivity is thermally activated with an activation energy of 10 meV, and the room temperature conductivity is 10 −1 to 10 −2 Ω −1 cm −1 . The charge transport is due to hopping between TMTSF sites. The real part of the dielectric constant is unexpectedly large, 200 at 300 K, and shows a weak temperature dependence. The presence of localized charge carriers can explain the magnitude of the dielectric constant. The spin systems associated with the TMTSF and DCNQI molecules, respectively, are strongly coupled. The dominating contribution to the ESR linewidth, above 130 K, is spin‐orbit coupling. The temperature dependence of the linewidth is due to electron phonon interaction and the hopping of the charge carriers. The susceptibility is high, 8 × 10 −4 e.m.u./mol at 300 K, and is dominated by the contribution from the spins associated with the DCNQI molecules. The temperature dependence is the one of an antiferromagnetically coupled one‐dimensional Heisenberg chain with an exchange interaction of about 6 K.