Pressure-induced decoupling of rare-earth moments and Mn spins in multiferroic GdMn2 O5

N. Poudel, M. Gooch, B. Lorenz, C. W. Chu, J. W. Kim, S. W. Cheong

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The effects of pressure on the ferroelectric properties of multiferroic GdMn2O5 is studied up to 18.2 kbar. Above a critical pressure of pc≈10 kbar, the ferroelectric transition splits into two, with the first transition shifted to higher temperature. The pressure-temperature phase diagram is derived. The results indicate a pressure-induced decoupling of the Gd moments from the Mn spin system. The conclusion is supported by thermal expansion data which show a large increase of the c axis at the ambient-pressure ferroelectric transition. The pressure-induced contraction of the c lattice parameter is considered to be the origin of the decoupling of both magnetic subsystems above pc.

Original languageEnglish
Article number144430
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number14
DOIs
Publication statusPublished - 2015 Oct 29

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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