Checkerboard to stripe charge ordering transition in TbBaFe2O5

TitleCheckerboard to stripe charge ordering transition in TbBaFe2O5
Publication TypeJournal Article
Year of Publication2013
AuthorsPratt DK, Chang S, Tian W, Taskin AA, Ando Y, Zarestky JL, Kreyssig A, Goldman AI, McQueeney RJ
Journal TitlePhysical Review B
Volume87
Pages045127
Date Published01
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000314094200004
Keywordsoxygen, spin, valence
Abstract

A combined neutron and x-ray diffraction study of TbBaFe2O5 reveals a rare checkerboard to charge ordering transition. TbBaFe2O5 is a mixed valent compound where Fe2+/Fe3+ ions are known to arrange into a stripe charge ordered state below T-V = 291 K that consists of alternating Fe2+/Fe3+ stripes in the basal plane running along the b direction. Our measurements reveal that the stripe charge ordering is preceded by a checkerboard charge ordered phase between T-V < T < T* = 308 K. The checkerboard ordering is stabilized by intersite Coulomb interactions which give way to a stripe state stabilized by orbital ordering. DOI: 10.1103/PhysRevB.87.045127

URL<Go to ISI>://WOS:000314094200004
DOI10.1103/PhysRevB.87.045127