New features in the phase diagram of TbMnO$_3$

Details New features in the phase diagram of TbMnO$_3$ New features in the phase diagram of TbMnO$_3$

2007-01-19

arxiv.org/abs/cond-mat/0701487v1

New Journal of Physics 9, 100 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages including 9 figures

Scientific paper

10.1088/1367-2630/9/4/100

The (H,T)-phase diagram of the multiferroic perovskite TbMnO$_3$ was studied by high-resolution thermal expansion $\alpha(T)$ and magnetostriction $\Delta L(H)/L$ measurements. Below $T_{N}\simeq 42$ K, TbMnO$_3$ shows antiferromagnetic order, which changes at $T_{FE}\simeq 28$ K where simultaneously a spontaneous polarization $P||c$ develops. Sufficiently high magnetic fields applied along $a$ or $b$ induce a polarization flop to $P||a$. We find that all of these transitions are strongly coupled to the lattice parameters. Thus, our data allow for a precise determination of the phase boundaries and also yield information about their uniaxial pressure dependencies. The strongly hysteretic phase boundary to the ferroelectric phase with $P||a$ is derived in detail. Contrary to previous reports, we find that even in high magnetic fields there are no direct transitions from this phase to the paraelectric phase. We also determine the various phase boundaries in the low-temperature region related to complex reordering transitions of the Tb moments.

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