Multiferroicity and magneto-electric effect in Gd{sub 2}BaNiO{sub 5}
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005 (India)
We report the observation of electric polarization in the magnetically ordered state of the Haldane chain compound, Gd{sub 2}BaNiO{sub 5}, with strongly correlated magnetic and dielectric properties. The results of dc magnetic susceptibility and heat capacity measurements indicate two magnetic transitions, one corresponding to the anti-ferromagnetic order at T{sub N} ∼ 55 K and the other to spin-reorientation transition at T{sub SR} ∼ 24 K. The dielectric permittivity (ϵ{sub r}{sup ′}) and loss (tanδ) also exhibit anomalies in the vicinity of T{sub SR} and T{sub N}, respectively. Below the spin-reorientation transition, concurrently magnetic-field-induced spin-flop and the meta-electric transitions are observed at a critical magnetic field in isothermal magnetization and magneto-dielectric results, respectively. Another interesting finding is that Δϵ{sub r}{sup ′} (=(ϵ{sub r}{sup ′}(H)−ϵ{sub r}{sup ′}(0))/ϵ{sub r}{sup ′}(0)) changes its sign at the critical magnetic field. The origin of the observed magneto-electric effect is discussed on the basis of spin–phonon coupling.
- OSTI ID:
- 22304219
- Journal Information:
- Journal of Applied Physics, Vol. 115, Issue 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
COUPLING
DIELECTRIC MATERIALS
GADOLINIUM COMPOUNDS
LOSSES
MAGNETIC FIELDS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
NEEL TEMPERATURE
NICKEL COMPOUNDS
OXYGEN COMPOUNDS
PERMITTIVITY
PHASE TRANSFORMATIONS
POLARIZATION
SPECIFIC HEAT