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

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${}_{SR}$ around 24 K. The dielectric permittivity (${\epsilon }^{\prime }$) and loss (tan$\delta$) also exhibit anomalies in the vicinity of T${}_{SR}$ 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.

published in JAP

References in corpus (2)

• CdV2O4: A rare example of a collinear multiferroic spinel
• Observation of a multiferroic critical end point

Cited by in corpus (5)

• Magnetic and dielectric behavior of the spin-chain compound Er2BaNiO5 well below its Néel temperature
• Existence of a critical canting angle of magnetic moments to induce multiferroicity in the Haldane spin-chain system, Tb2BaNiO5
• Enhancement of magnetodielectric coupling in 6H-perovskites Ba3RRu2O9 for heavier rare earth cations (R=Ho,Tb)
• Canting angle behavior of magnetic moments in Y- substituted Tb2BaNiO5 and its relevance for magnetoelectric coupling
• Spin-Chain Incipient Magnetocaloric Effect and Rare-Earth Controlled Switching in the Haldane-Chain System, R2BaNiO5