Abstract
The search for materials with strong magnetoelectric coupling has been intense since interesting properties were discovered in the perovskite TbMnO3. Among the manganese-based perovskite family (RMnO3), magnetic and electric orders coexist in the orthorhombic phase of the distorted perovskite TmMnO3. The antiferromagnetic phase induces ferroelectricity, leading to type–II multiferroic behavior. Although the temperature-dependent behavior of the Raman-active phonons of other members of the orthorhombic RMnO3 family was already reported, little information about orthorhombic TmMnO3 has been published. In this paper, bulk samples of orthorhombic TmMnO3 were obtained through HPHT treatment. Structural and magnetic properties of the synthesized samples were analyzed for phase confirmation. Temperature-dependent Raman spectra of bulk orthorhombic TmMnO3 revealed weak spin-phonon coupling in the incommensurate antiferromagnetic ordered phase around 44 K. Raman spectra are also sensitive to the magnetic transition from the incommensurate to E-type antiferromagnetic phase, where the frequency renormalization due to the spin-phonon coupling vanishes. This feature shows the existence of an orbital-spin-phonon coupling based on the magnetic ordering of the low-temperature phase.
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