Uniaxial pressure dependencies of the phase transitions in GdMnO$_3$

Details Uniaxial pressure dependencies of the phase transitions in GdMnO$_3$ Uniaxial pressure dependencies of the phase transitions in GdMnO$_3$

2006-05-22

arxiv.org/abs/cond-mat/0605515v1

J. Magn. Magn. Mat. 310, 1165 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 3 figures, submitted to JMMM (Proceedings of ICM'06, Kyoto)

Scientific paper

GdMnO$_3$ shows an incommensurate antiferromagnetic order below $\simeq 42$ K, transforms into a canted A-type antiferromagnet below $\simeq 20$ K, and for finite magnetic fields along the b axis ferroelectric order occurs below $\simeq 12$ 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 $R$MnO$_3$ ($R = {\rm La, ... Dy}$).

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