Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 12, Pages 3364-3369Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.3364
Keywords
organic conductor; charge order; dielectric constant; nonlinear conduction; intrinsic inhomogeneity
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The dielectric constant and ac conductivity have been measured for the layered organic conductor theta(BEDT-TTF)(2)CsZn(SCN)(4) along the out-of-plane direction, which show a relaxation behavior similar to those in the charge-density-wave conductor. Most unexpectedly, they exhibit a large bias dependence with a hysteresis, and changes in magnitude by 100-1000 times at a threshold. These findings are very similar to the collective excitation of the charge density wave. theta-(BEDT-TTF)(2)CsZn(SCN)(4) has collective excitations associated with charge ordering, though it shows no clear indication of long range order.
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