2007/01/19 by D. Meier, Dennis Meier, N. Aliouane +3 · 1 citation
Materials Science · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Dielectric #Ferroelectric and Piezoelectric Materials #Ferroelectricity #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Multiferroics #Multiferroics and related materials #Phase (matter) #Phase boundary #Phase diagram #Phase transition #Physics #Polarization (electrochemistry) #Quantum mechanics #cond-mat.str-el
paper · pdf · doi:10.1088/1367-2630/9/4/100
published as New Journal of Physics 9, 100 (2007) · 17 pages including 9 figures
arxiv created 2007/01/19 · openalex publication_date 2007/04/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The ( H , T )-phase diagram of the multiferroic perovskite TbMnO 3 was studied by high-resolution thermal expansion α( T ) and magnetostriction Δ L ( H )/ L measurements. Below T N ≃ 42 K, TbMnO 3 shows antiferromagnetic order, which changes at T FE ≃ 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.