Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

Article

关键词: EARTH RHODIUM BORIDES;    GAP EXCITATIONS;    RARE-EARTH;    FERROELECTRIC POLARIZATION;    MAGNETIC-SUSCEPTIBILITY;    NEUTRON-DIFFRACTION;    ELECTRIC-FIELD;    OXIDES;    TRANSITION;    ND2BANIO5;   

DOI  :  10.1103/PhysRevB.96.014418

来源: SCIE

【 摘 要 】

The Haldane spin-chain compound Tb2BaNiO5 has been known to order antiferromagnetically below (T-N =) 63K. The present magnetic studies on the polycrystals bring out that there is another magnetic transition at a lower temperature (T-2 =) 25K with pronounced magnetic-field-induced metamagnetic and metaelectric behaviors. Multiferroic features are found below T-2 only and not at T-N. The most intriguing observation is that the observed change in dielectric constant (Delta epsilon') is intrinsic and largest (e.g., similar to 18% at 15 K) within this Haldane spin-chain family R2BaNiO5. Taking into account the fact that this trend (that is, the largest value of Delta epsilon' for the Tb case within this family) correlates well with a similar trend in T-N (with the values of T-N being similar to 55, 58, 53, and 32 K for Gd, Dy, Ho, and Er cases), we believe that the explanation usually offered for this T-N behavior in rare-earth systems is applicable for this Delta epsilon' behavior as well. That is, single-ion anisotropy following crystal-field splitting is responsible for the extraordinary magnetodielectric effect in this Tb case. This work provides a pathway in the field of multiferroics to promote magnetoelectric coupling.

【 授权许可】

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