New features in the phase diagram of TbMnO${}_3$

Abstract

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.

arXiv comment17 pages including 9 figures

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Cited by in corpus (10)

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• Anomalous thermal expansion and strong damping of the thermal conductivity of NdMnO${}_3$ and TbMnO${}_3$ due to 4f crystal-field excitations
• Field dependence of magnetic correlations through the polarization flop transition in multiferroic TbMnO3 : evidence for a magnetic memory effect
• Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO${}_3$
• Giant electro-thermal conductivity and spin-phonon coupling in an antiferromagnetic oxide
• Spin-wave dispersion and magnon chirality in multiferroic TbMnO3
• Temperature-Dependent Infrared Reflectivity Studies of Multiferroic TbMnO_{3}: Evidence for Spin-Phonon Coupling
• New applications for the world's smallest high-precision capacitance dilatometer and its stress-implementing counterpart
• Elastic and magnetoelastic properties of TbMnO3 single crystal by nanosecond time resolved acoustics and first-principles calculations