Falqui Andrea, Lampis Nathascia, Geddo-Lehmann Alessandra, Pinna Gabriella
Dipartimento di Scienze Chimiche, Università degli, Studi di Cagliari, S.P. Monserrato-Sestu km 0.700, I-09042 Monserrato, (Cagliari), Italy.
J Phys Chem B. 2005 Dec 8;109(48):22967-70. doi: 10.1021/jp0551014.
The isostructural perovskite compounds PbFe(1/2)Ta(1/2)O3 and PbFe(1/2)Nb(1/2)O3 have been known for long time, and they are part of the important class of materials called multiferroic, where ferroelasticity, ferroelectricity, and ferromagnetism coexist. In the literature regarding PbFe(1/2)Ta(1/2)O3 and PbFe(1/2)Nb(1/2)O3, an "anomaly" of their low-temperature magnetic behavior has not always been reported. Moreover, both the origin of this behavior, and the cause for which it was not always observed, were never completely explained. In this paper, the magnetic behavior of the two compounds at low temperature has been extensively studied and explained as the occurring of a spin-glasslike transition.
同结构的钙钛矿化合物PbFe(1/2)Ta(1/2)O3和PbFe(1/2)Nb(1/2)O3已为人所知很久了，它们是称为多铁性材料这一重要材料类别的一部分，在这类材料中，铁弹性、铁电性和铁磁性共存。在关于PbFe(1/2)Ta(1/2)O3和PbFe(1/2)Nb(1/2)O3的文献中，其低温磁行为的“异常”并非总是被报道。此外，这种行为的起源以及并非总是观察到这种行为的原因从未得到过完整解释。在本文中，对这两种化合物在低温下的磁行为进行了广泛研究，并解释为发生了类似自旋玻璃的转变。
