High Magnetic Field Dependence of Magnetodielectric Properties in Sr2CoSi2O7 Crystal

• Published in: Journal of low temperature physics Vol. 170; no. 5-6; pp. 291 - 295
• Main Authors: Akaki, M., Tadokoro, T., Kihara, T., Tokunaga, M., Kuwahara, H.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-03-2013
• Subjects: Asymmetry; Characterization and Evaluation of Materials; Condensed Matter Physics; Crystals; Electric polarization; Magnetic fields; Magnetic Materials; Magnetic properties; Magnetic transitions; Magnetism; Magnetization; Orbitals; Physics; Physics and Astronomy; Antiferromagnetism; Cobaltite; Magnetoelectric effects; Multiferroics
• ISSN: 0022-2291; 1573-7357
• DOI: 10.1007/s10909-012-0796-z

We have investigated magnetic and dielectric properties of åkermanite Sr
2
CoSi
2
O
7
single crystal in which the orbital hybridization is controllable by external magnetic fields. Sr
2
CoSi
2
O
7
shows the electric polarization that is originated from asymmetric orbital hybridization induced by magnetic field. This induced electric polarization was observed even at temperatures considerably higher than the magnetic transition temperature. The polarization data obtained for the paramagnetic phase are scaled with the square of the induced magnetization. By the discussion of the crystal symmetry, the space group of a polar state of åkermanite materials is probably
Cmm
2.