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首页> 外文期刊>Physica, B. Condensed Matter >Dielectric and multiferroic behavior in Sm2BaNiO5, a Haldane spin-chain compound
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Dielectric and multiferroic behavior in Sm2BaNiO5, a Haldane spin-chain compound

机译：SM 2 BANIO 5 ，卤代旋转链化合物

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Abstract The Haldane spin-chain (S = 1) insulating compound, Sm2BaNiO5, which has been proposed to order antiferromagnetically around (T N = ) 55K, was investigated for its complex dielectric permittivity, magnetodielectric and pyrocurrent behavior as a function of temperature (T). In order to enable meaningful discussions, the results of ac and dc magnetization and heat-capacity studies are also reported. We emphasize on the following findings: (i) There is a pyrocurrent peak near T N , but it is shown not to arise from ferroelectricity, but possibly due to ‘thermally stimulated depolarization current’, unlike in many other members of this rare-earth series in which case ferroelectric features were reported at or above T N ; (ii) however, the pyrocurrent measured in 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 22K–the temperature around which population of the exchange-split excited state of Kramers doublet has been known to occur. This finding suggests that this compound presents a novel situation in which multiferroicity is induced by an interplay between c
机译：<！[cdata [ 抽象 卤代旋转链（S = 1）绝缘化合物，SM 2 Banio 5 ，已提议向周围排序（ T n =）55 k，以其复杂的介电介电常数，磁电电和发热行为作为函数温度（ t ）。为了实现有意义的讨论，还报道了AC和直流磁化和热容量研究的结果。我们强调以下发现：（i）在 t n ，但它显示出不从铁电性出现，但可能由于“热刺激的去极化电流”，与该稀土系列的许多其他成员不同，在这种情况下，在这种情况下报告了铁电特征< CE：斜体> t n ;然而，（ii）然而，在偏置电场（在零电场冷却后的存在）存在下测量的发货电流以及介电常数，随着增加的 t 左右22 < CE：HSP SP =“0.25”/> K-众所周知，已知发生克拉姆斯克拉姆分裂型克拉姆的群体的温度。该发现表明，该化合物具有新的情况，其中通过C之间的相互作用引起多重性

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