Spin dynamics and charge order-disorder phase transition detected by EPR in α'-(BEDT-TTF)2IBr2
Abstract
Stepwise changes in electron paramagnetic resonance (EPR) parameters (integral intensity, linewidth) accompanying localization of charge carriers have been found in the α'-(BEDT-TTF)2IBr2 crystals. In single crystal exchange narrowing of the EPR lines and sharp decrease in static and dynamic magnetic susceptibility caused by antiferromagnetic interaction of localized charge carriers is observed at T < 50 K. At T > 50 K a difference between static and dynamic magnetic susceptibility is observed in the α'-(BEDT-TTF)2IBr2 crystals which is due to that the frequency of thermally activated charge carrier jumps is higher than the microwave frequency of measuring field of an EPR spectrometer.
About the Authors
A. I. Dmitriev
Institute of Problems of Chemical Physics Russian Academy of Sciences
Russian Federation
Russian Federation
Semenova, 1, Chernogolovka 142432
A. S. Chernenkaya
Institute of Problems of Chemical Physics Russian Academy of Sciences
Russian Federation
Russian Federation
Semenova, 1, Chernogolovka 142432
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Review
For citations:
Dmitriev A.I., Chernenkaya A.S. Spin dynamics and charge order-disorder phase transition detected by EPR in α'-(BEDT-TTF)2IBr2. Magnetic Resonance in Solids. 2010;12(2):17-21.
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