X phase of MnWO4

I. Urcelay-Olabarria, E. Ressouche, A. A. Mukhin, V. Yu Ivanov, A. M. Kadomtseva, Yu F. Popov, G. P. Vorob'Ev, A. M. Balbashov, J. L. García-Muñoz, V. Skumryev

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

A long-standing issue, the magnetic structure of the so-called X phase of MnWO4, has been solved by single-crystal neutron diffraction. Emerging from the well-known ferroelectric phase which presents an electric polarization P//b and which is induced by a cycloidal magnetic order called AF2, this phase is reached by application of a magnetic field along the b axis and is characterized by a flop of the electric polarization towards the a axis. We have identified this new phase as a reoriented cycloidal spin structure, AF2', and its evolution from the AF2 phase has been thoroughly described. Unlike for the usual magnetic-field-induced spin-flop transitions, this high-field flopped phase does not directly develop from the low-field phase but emerges via the nonpolar collinear commensurate AF1 phase, which creeps in between. This evolution is in good agreement with the observed field-induced change in Pb and Pa electric polarization as well as with magnetic susceptibility data. © 2014 American Physical Society.
Original languageEnglish
Article number024408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number2
DOIs
Publication statusPublished - 15 Jul 2014

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