Ground state in \kappa-(BEDT-TTF)$_{2}$Hg(SCN)$_{2}$Br studied by Raman Spectroscopy and Heat Capacity measurements
ORAL
Abstract
Quasi-two-dimensional organic conductor \kappa-(BEDT-TTF)$_{2}$Hg(SCN)$_{2}$Br is a Mott insulator ($T$_{c}$\approx 100K$) on a triangular lattice which makes it a potential spin liquid candidate. To elucidate its magnetic ground state we study heat capacity and Raman response of single crystals of this material. Our low temperature heat capacity measurements suggest a presence of a linear term in the temperature dependence, which might indicate the existence of gapless spinons. Vibrational Raman response indicates a presence of charge order fluctuations in the insulating state. The low-frequency Raman response is discussed in terms of fluctuations of “paired electron crystal’’ state [1]. [1] S. Dayal, R. T. Clay, H. Li, and S. Mazumdar, Phys. Rev. B 83, 245106 (2011)
*The work at IQM was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Material Sciences and Engineering, under Grant No. DEFG02-08ER46544.
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