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Title: Multiferroicity and magneto-electric effect in Gd{sub 2}BaNiO{sub 5}

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.
Authors:
;  [1] ; ; ;  [2]
  1. Indian Institute of Technology Bhubaneswar, Bhubaneswar, Odisha 751013 (India)
  2. Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005 (India)
Publication Date:
OSTI Identifier:
22304219
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 21; 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; 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