Multiferroicity and magneto-electric effect in Gd$_2$BaNiO$_5$

S. Chowki; Tathamay Basu; K. Singh; N. Mohapatra; E. V. Sampathkumaran

doi:10.1063/1.4881531

paper

Multiferroicity and magneto-electric effect in Gd $_{2}$ BaNiO $_{5}$

arXiv:1407.5307 · doi:10.1063/1.4881531

Abstract

We report the observation of electric polarization in the magnetically ordered state of the Haldane chain compound, Gd $_{2}$ BaNiO $_{5}$ , 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 $_{N}$ around 55 K and the other to spin-reorientation transition at T $_{S R}$ around 24 K. The dielectric permittivity ( $ε^{'}$ ) and loss (tan $δ$ ) also exhibit anomalies in the vicinity of T $_{S R}$ and T $_{N}$ 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 the change in dielectric constant 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.

arXiv commentpublished in JAP

Multiferroicity and magneto-electric effect in Gd $_{2}$ BaNiO $_{5}$

Abstract

References in corpus (6)

Cited by in corpus (7)

Multiferroicity and magneto-electric effect in Gd2​BaNiO5​

Abstract

References in corpus (6)

Cited by in corpus (7)

Multiferroicity and magneto-electric effect in Gd $_{2}$ BaNiO $_{5}$