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

doi:10.1103/PhysRevB.92.144430

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 journal › Article › peer-review

15 Scopus citations

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 language	English
Article number	144430
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.92.144430
State	Published - Oct 29 2015
Externally published	Yes

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@article{a460caffbaae4a41afe60c9ba2ba178d,

title = "Pressure-induced decoupling of rare-earth moments and Mn spins in multiferroic GdMn2 O5",

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.",

author = "N. Poudel and M. Gooch and B. Lorenz and Chu, \{C. W.\} and Kim, \{J. W.\} and Cheong, \{S. W.\}",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = oct,

day = "29",

doi = "10.1103/PhysRevB.92.144430",

language = "English",

volume = "92",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

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}

TY - JOUR

T1 - Pressure-induced decoupling of rare-earth moments and Mn spins in multiferroic GdMn2 O5

AU - Poudel, N.

AU - Gooch, M.

AU - Lorenz, B.

AU - Chu, C. W.

AU - Kim, J. W.

AU - Cheong, S. W.

PY - 2015/10/29

Y1 - 2015/10/29

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/84946811710

U2 - 10.1103/PhysRevB.92.144430

DO - 10.1103/PhysRevB.92.144430

M3 - Article

AN - SCOPUS:84946811710

SN - 1098-0121

VL - 92

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 14

M1 - 144430

ER -

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

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