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The Haldane spin-chain (S=1) insulating compound, Sm2BaNiO5, which has beenproposed to order antiferromagnetically around (T_N=) 55 K, was investigatedfor its complex dielectric permittivity, magnetodielectric and pyrocurrentbehavior as a function of temperature (T). In order to enable meaningfuldiscussions, the results of ac and dc magnetizatioin and heat-capacity studiesare also reported. We emphasize on the following findings: (i) There is apyrocurrent peak near T_N, but it is shown not to arise from ferroelectricity,but possibly due to 'thermally stimulated depolarization current', unlike inmany other members of this rare-earth series, in which case ferroelectricfeatures were reported at or above T_N; (ii) however, the pyrocurrent measuredin the presence of a bias electric field (after cooling in zero electric field)as well as dielectric constant reveal a weak peak with increasing T around 22 K- the temperature around which population of the exchange-split excited stateof Kramers doublet has been known to occur. This finding suggests that thiscompound presents a novel situation in which multiferroicity is induced by aninterplay between crystal-field effects and exchange interaction. No multiglassfeatures could be observed down to 2 K unlike in many members of this family.

Dielectric and multiferroic behavior in a Haldane spin-chain compound  Sm2BaNiO5 due to an interplay between crystal-field effect and exchange  interaction