Magnetic susceptibility, phonons and dielectric constant of single crystalline BiFeO3

Abstract

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.

3 figures, 1 table and 22 references. Submission for International Conference on Magnetism (ICM) 2009 in Karlsruhe - Germany with the poster session No. Tu-D-1.11-35

References in corpus (2)

• Room temperature coexistence of large electric polarization and magnetic order in BiFeO3 single crystals
• Bi(1-x)R(x)FeO(3)(R=rare earth): a family of novel magnetoelectrics

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• Combined electrostatic and strain engineering of BiFeO${}_3$ thin films at the morphotropic phase boundary
• In Praise and in Search of Highly-Polarizable Semiconductors