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

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.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3]
  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)
Publication Date:
OSTI Identifier:
22410034
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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