High frequency dielectric and magnetic anomaly at the phase transition in NaV2O5
A. I. Smirnov, M. N. Popova, A. B. Sushkov, S. A. Golubchik, D. I. Khomskii, M. V. Mostovoy, A. N. Vasil'ev, M. Isobe, Y. Ueda
Abstract
We found anomalies in the temperature dependence of the dielectric and the magnetic susceptibiliy of NaV2O5 in the microwave and far infrared frequency ranges. The anomalies occur at the phase transition temperature Tc, at which the spin gap opens. The real parts of the dielectric constants epsilona and epsilonc decrease below Tc. The decrease of epsilona (except for the narrow region close to Tc) is proportional to the intensity of the x-ray reflection appearing at Tc. The dielectric constant anomaly can be explained by the zigzag charge ordering in the ab-plane appearing below Tc. The anomaly of the microwave magnetic losses is probably related to the coupling between the spin and charge degrees of freedom in vanadium ladders.
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