Сompeting magnetic states and structural modifications in multiferroic YMn2O5 at high pressureстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 26 ноября 2015 г.
Аннотация:The structural, magnetic and vibrational properties of YMn2O5 multiferroic have been studied by means of X-ray, neutron powder diffraction and Raman spectroscopy at pressures up to 30 GPa. Application of high pressure P > 1 GPa leads to a gradual suppression of the commensurate and incommensurate antiferromagnetic (AFM) phases with a propagation vector q = (1/2, 0, qz ~ 1/4) and appearance of the commensurate AFM phase with q = (1/2, 0, 1/2). At P ~ 16 GP a structural phase transformation accompanied by anomalies in lattice compression and pressure behaviour of vibrational modes was observed. A comparative analysis of the observed pressure-induced magnetic transformations in YMn2O5 and modification of magnetic states in RMn2O5 compounds by variation of R- cation radius provides clear evidence that qz component of the propagation vector is controlled by a balance of competing Mn4+ - Mn4+ magnetic interactions in octahedral chains and Mn4+ - O2- Mn3+ interactions linking Mn4+O6 octahedra and Mn3+O5 pyramids.