Non-resonant and resonant x-ray scattering studies on multiferroic TbMn2O5

TitleNon-resonant and resonant x-ray scattering studies on multiferroic TbMn2O5
Publication TypeJournal Article
Year of Publication2007
AuthorsKoo J, Song C, Ji S, Lee JS, Park J, Jang TH, Yang CH, Park JH, Jeong YH, Lee KB, Koo TY, Park YJ, Kim JY, Wermeille D, Goldman AI, Srajer G, Park S, Cheong SW
Journal TitlePhysical Review Letters
Volume99
Pages197601
Date PublishedNov
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000250810500067
KeywordsMAGNETIC PHASE-TRANSITIONS, neutron-diffraction, polarization
Abstract

Comprehensive x-ray scattering studies, including resonant scattering at Mn L, Tb L, and M edges, were performed on single crystals of TbMn2O5 for crystallographic data to elucidate the nature of its commensurate and incommensurate phases. The scattering results provide direct evidence of symmetry lowering to the ferroelectric phase driven by magnetically induced lattice modulations and show the presence of multiple magnetic orders. The competing orders under spin-frustrated geometry are believed to cause discommensuration and result in the commensurate-to-incommensurate phase transition around 24 K. It is proposed that the low temperature incommensurate phase consists of commensurate domains separated by antiphase domain walls which change both signs of spontaneous polarizations and x-ray scattering amplitudes for forbidden reflections.

DOI10.1103/PhysRevLett.99.197601
Alternate JournalPhys. Rev. Lett.