Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-06-16
J. Phys.: Conf. Series 200, 012106 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
3 figures, 1 table and 22 references. Submission for International Conference on Magnetism (ICM) 2009 in Karlsruhe - Germany w
Scientific paper
10.1088/1742-6596/200/1/012106
The magnetic susceptibility between 1.5 and 800 K, the infrared reflectivity at room temperature and the temperature dependence of the dielectric constant at mm-wavelengths are reported for single crystalline BiFeO3. A well developed anomaly in the magnetic susceptibility signals the onset of antiferromagnetic order close to 640 K. Beside this anomaly, no further indications of phase or spin-glass transitions are found in the susceptibility down to the lowest temperatures. From infrared reflectivity we were able to identify all 9 phonon modes which are expected to be infrared active within the ab plane of the crystal. The temperature dependence of the dielectric constant was measured contact free in the 100 GHz range yielding e' = 54 at room temperature. The loss is substantial and strongly frequency dependent indicating the predominance of hopping conductivity.
Loidl Alois
Lu Jun
Lunkenheimer P.
Mukhin A. A.
Pimenov Andrei
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