Magnetic, dielectric, and magnetoelectric properties in Sr{sub 2}CoGe{sub 2}O{sub 7}

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4916551· OSTI ID:22410034

Song, Y. Q.; Li, Q.; Zhou, W. P.; Cao, Q. Q.; Du, Y. W. ^[1]; Zhang, Z. M. ^[2]; Xu, Q. Y. ^[3]

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1. National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093 (China)
2. Department of Applied Physics, Nanjing Tech University, Nanjing 210009 (China)
3. Department of Physics, Southeast University, Nanjing 211189 (China)

We investigate the magnetoelectric effect in Sr{sub 2}CoGe{sub 2}O{sub 7}, which has a two-dimensional magnetic interaction between Co ions in the ab plane. This compound shows a weak magnetism and field-induced magnetic transition below the temperature of 7 K. It does not exhibit electric polarization under zero magnetic field. However, by applying an external magnetic field, the electric polarization is induced around its Néel temperature and increases with increasing magnetic field. The induced electric polarization in Sr{sub 2}CoGe{sub 2}O{sub 7} is almost two orders of magnitude smaller than that of Ba{sub 2}CoGe{sub 2}O{sub 7}. This result suggests that the different ionic radius of the strontium and the barium anion plays a key role in determining the property of electric polarization. The origins of electric polarization and magnetoelectric effect are discussed.

• OSTI ID: 22410034
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANIONS
COBALT COMPOUNDS
COBALT IONS
DIELECTRIC MATERIALS
ELECTRICAL PROPERTIES
GERMANATES
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETISM
NEEL TEMPERATURE
PHASE TRANSFORMATIONS
POLARIZATION
STRONTIUM COMPOUNDS
STRONTIUM IONS
TEMPERATURE DEPENDENCE
TWO-DIMENSIONAL SYSTEMS