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.
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2015 10月 29|
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