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Title: The enhanced spontaneous dielectric polarization in Ga doped CuFeO{sub 2}

The magnetic and dielectric polarization properties of the single crystal samples of CuFe{sub 1−x}Ga{sub x}O{sub 2} (x = 0 and 0.02) are investigated. Experimental results show that the magnetization and dielectric polarizations are anisotropy and coupled together. Compared with pure CuFeO{sub 2}, in the case with the magnetic field parallel to the c axis, a field-induced phase transition with a hysteresis is clearly observed between the five-sublattice (5SL) and three-sublattice (3SL) phases. Specially, an obvious spontaneous dielectric polarization is observed in CuFe{sub 0.98}Ga{sub 0.02}O{sub 2} in a lower magnetic field region, indicating that the Ga doping has an effect on the enhancement of spontaneous dielectric polarization. Based on the dilution effect, change of exchange interaction, and partial release of the spin frustration due to the structural modulation of the Ga ion dopant, the origin of the magnetization, and spontaneous polarization characteristics are discussed and the complete dielectric polarization diagrams are assumed.
Authors:
; ; ; ;  [1] ;  [2] ; ; ; ;  [1]
  1. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22308210
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 17; Other Information: (c) 2014 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; ANISOTROPY; COPPER COMPOUNDS; DIELECTRIC MATERIALS; DOPED MATERIALS; EXCHANGE INTERACTIONS; FERRITES; GALLIUM ADDITIONS; HYSTERESIS; MAGNETIC FIELDS; MAGNETIZATION; MODULATION; MONOCRYSTALS; PHASE TRANSFORMATIONS; POLARIZATION; SPIN