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Absence of charge order in the dimerized kappa-phase BEDT-TTF salts (CROSBI ID 192830)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Sedlmeier, K. ; Elsaesser, S. ; Neubauer, D. ; Beyer, Rebecca ; Wu, D. ; Ivek, Tomislav ; Tomić, Silvia ; Schlueter, John A. ; Dressel, Martin Absence of charge order in the dimerized kappa-phase BEDT-TTF salts // Physical review. B, Condensed matter and materials physics, 86 (2012), 245103-1-245103-10. doi: 10.1103/PhysRevB.86.245103

Podaci o odgovornosti

Sedlmeier, K. ; Elsaesser, S. ; Neubauer, D. ; Beyer, Rebecca ; Wu, D. ; Ivek, Tomislav ; Tomić, Silvia ; Schlueter, John A. ; Dressel, Martin

engleski

Absence of charge order in the dimerized kappa-phase BEDT-TTF salts

Utilizing infrared vibrational spectroscopy we have investigated dimerized two-dimensional organic salts in oredr to serach for possible charge redistribution that might constitute electronic dipoles and ferroelectricity: the qunatum spin liquid kappa-(BEDT-TTF)2Cu2(CN)3, the antiferromagnetic Mott insulator kappa-(BEDT-TTF)2Cu[N(CN)2]Cl and the superconductor kappa-(BEDT-TTF)2Cu[N(CN)2]Br. None of them exhibit any indication of charge disproportionation. Upon cooling to low temperatures all BEDT-TTF remain homogeneously charged within +/- 0.005e. No modification in the charge distribution is observed around T=6K where a low-temperature anomaly has been reported for the spin liquid material kappa-(BEDT-TTF)2Cu2(CN)3. In this compound the in-plane optical response and vibrational coupling are rather anisotropic, indicating that the tilt of the BEDT-TTF molecules in c-direction and their coupling to the anion layers has to be considered in the explanation of the electromagnetic properties.

charge order; charge disproportionation; 2D organic Mott insulators; infrared vibrational spectroscopy; ferroelectricity

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Podaci o izdanju

86

2012.

245103-1-245103-10

objavljeno

1098-0121

10.1103/PhysRevB.86.245103

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