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

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 doi:10.1103/PhysRevB.86.245103 (međunarodna recenzija, članak, znanstveni)

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

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

Physical Review B - Condensed Matter and Materials Physics (1098-0121) 86 (2012); 245103-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

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

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.

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Projekt / tema
035-0000000-2836 - Jako korelirani anorganski, organski i biomaterijali (Silvia Tomić, )

Institut za fiziku, Zagreb

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  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus