Local structural distortion induced by antiferromagnetic ordering in Bi$_2$Fe$_4$O$_9$ studied using neutron total scattering analysis

Autor:	Jeong, I. -K., Hur, N.
Rok vydání:	2016
Předmět:	Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.3938/jkps.69.75
Popis:	To unravel the origin of the dielectric anomaly at the antiferromagnetic ordering of magnetoelectric Bi$_2$Fe$_4$O$_9$ we performed neutron powder diffraction measurements across the N$\acute{\rm e}$el temperature, $T_{\rm N}$. Both local structures and long-range symmetry are studied using the complementary analyses of atomic pair distribution function (PDF) and Rietveld methods at temperatures 300~K, 250~K, and 200~K. We present that PDF peaks which reflect local atomic arrangements exhibit a noticeable variation below $T_{\rm N}$ without long-range symmetry change. The implication of the PDF evolution is discussed in view of a local structural distortion at the onset of the antiferromagnetic ordering. Comment: 10 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1605.03681 Zobrazit plný text záznamu View this record from Arxiv