2001/03/29 by D. G. Tomuta, Tomuta, D. G., S. Ramakrishnan +5
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Multiferroics and related materials #Solid-state spectroscopy and crystallography #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.cond-mat/0103609
LaTeX2e,8 pages, 8 figures
openalex publication_date 2001/03/29 · arxiv created 2001/04/11 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report the magnetic susceptibility, specific heat and dielectric constant on high purity polycrystalline samples of three hexagonal manganites: YMnO3, LuMnO3 and ScMnO3. These materials can exhibit a ferroelectric transition at very high temperatures (TFE > 700K). At lower temperatures there is magnetic ordering of the frustrated Mn3+ spins (S=2) on a triangular Mn lattice (YMnO3:TN=71K; LuMnO3:TN=90K and ScMnO3:TN=130K). The transition is characterized by a sharp kink in the magnetic susceptibility at TN below which it continues to increase due to the frustration on the triangular lattice. The specific heat shows one clear continuous phase transition at TN, which is independent of external magnetic field up to 9T with an entropy content as expected for Mn3+ ions. The temperature dependent dielectric constant displays a distinct anomaly at TN.