Inhomogeneous spin state in the organic conductor κ -(BEDT-TTF) 4 Hg 2.78 Cl 8

Kurosaki, Yosuke; Furuta, Akira; Taniguchi, Hiromi; Miyagawa, Kazuya; Kanoda, K.

doi:10.1016/j.physb.2009.07.070

Cited by 3 publications

(1 citation statement)

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“…It is emphasized that the magnitude of the γ values are enhanced up to 55 mJ K −2 mol −1 for HgBr and 52 mJ K −2 mol −1 for HgCl. Kurosaki et al [48] observed by 13 C-NMR that antiferromagnetic fluctuations are much enhanced from the usual κ-(BEDT-TTF) 2 X system anomalously down to the dilution temperature region. The enhancement of static parameters observed by heat capacity and magnetic susceptibility and T 1 −1 means that the effective mass is enhanced due to the electron correlations, just as in the case of itinerant magnetic systems in intermetallic compounds based on 3d transition metal and 4f, 5f heavy ferimion electron systems.…”

Section: κ-(Bedt-ttf) 2 Ag(cn) 2 H 2 O and κ-(Mdt-ttf) 2 Auimentioning

confidence: 99%

Thermodynamic Properties of κ-(BEDT-TTF)2X Salts: Electron Correlations and Superconductivity

Nakazawa

2012

Crystals

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Abstract:Heat capacity measurements of κ-(BEDT-TTF) 2 X (BEDT-TTF: Bis(ethylendithio) tetrathiafulvalene, X: counteranions) which are classified as two-dimensional (2D) dimer-Mott system are reported. At first, we explain structural and electronic features originated from rigid dimerization in donor arrangement in 2D layers. The antiferromagnetic Mott insulating phase located at low-pressure region in the phase diagram shows vanishing γ electronic heat capacity coefficient in the heat capacity, which claims opening of a charge-gap in this insulating state. Then, a systematic change of the γ around the Mott boundary region is reported in relation to the glass freezing of ethylene dynamics. The thermodynamic parameters determined by ∆C p /γT c of 10 K class superconductors, κ-(BEDT-TTF) 2 Cu(NCS) 2 and κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br demonstrate that a rather large gap with a strong coupling character appears around the Fermi-surface. On the other hand, the low temperature heat capacity clearly shows a picture of nodal-gap structure due to an anisotropic pairing. The comparison with lower T c compounds in the κ-type structure is also performed so as to discuss overall features of the κ-type superconductors. The heat capacity measurements of hole-doped systems containing mercury in the counteranions show an anomalous enhancement of γ, which is consistent with the T 1 −1 of NMR experiments etc. The results of heat capacity measurements under high pressures are also reported. OPEN ACCESSCrystals 2012, 2 742

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Section: κ-(Bedt-ttf) 2 Ag(cn) 2 H 2 O and κ-(Mdt-ttf) 2 Auimentioning

confidence: 99%