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Uniaxial pressure dependencies of the phase transitions in GdMnO3

J. Baier, D. Meier, K. Berggold, J. Hemberger, A. Balbashov, J. A. Mydosh, T. Lorenz

cond-mat.str-elarXiv:cond-mat/0605515

Abstract

GdMnO3 shows an incommensurate antiferromagnetic order below 42 K, transforms into a canted A-type antiferromagnet below 20 K, and for finite magnetic fields along the b axis ferroelectric order occurs below 12 K. From high-resolution thermal expansion measurements along all three principal axes, we determine the uniaxial pressure dependencies of the various transition temperatures and discuss their correlation to changes of the magnetic exchange couplings in RMnO3 (R = La, ... Dy).

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