Anomalous Sign Change in Hall Coefficient of κ-(BEDT-TTF)2Cu[N(CN)2]Br Under Pressure
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We studied the normal state properties of an organic superconductor, κ- (BEDT-TTF)2Cu[N(CN)2]Br, through the measurement of the Hall effect as functions of temperature and pressure. At low pressure, the Hall coefficient shows the peak structure. From the coincidence of the temperature and its pressure evolution with those of anomalies observed in other physical properties, the peak temperature is considered to be T*. At high pressure, we observed the drastic decrease and sign change of the Hall coefficient. From the incompatibility with the behavior of a similar compound, κ- (BEDT-TTF)2Cu(NCS)2, we concluded that this behavior originate from the singularity of the Fermi surface of this salt.
PACS numbers61.10 Nz 72.80 Le 74.70. Kn
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