2004/08/31 by B. Lorenz, Y. Q. Wang, Yanyi Sun +2 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Coupling (piping) #Coupling constant #Dielectric #Diffraction #Hysteresis #Magnetic and transport properties of perovskites and related materials #Materials science #Metastability #Multiferroics and related materials #Nuclear magnetic resonance #Optics #Orthorhombic crystal system #Physics #Quantum mechanics #Spins #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.70.212412
published as Phys. Rev. B 70, 212412 (2004) · revised manuscript
openalex publication_date 2004/12/30 · arxiv created 2005/01/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have found a remarkable increase (up to 60%) of the dielectric constant with the onset of magnetic order at 42\phantom\rule0.3em0exK in the metastable orthorhombic structures of YMnO3 and HoMnO3 that proves the existence of a strong magnetodielectric coupling in the compounds. Magnetic, dielectric, and thermodynamic properties show distinct anomalies at the onset of the incommensurate magnetic order and thermal hysteresis effects are observed around the lock-in transition temperature at which the incommensurate magnetic order locks into a temperature independent wave vector. The Mn3+ spins and Ho3+ moments both contribute to the magnetodielectric coupling. A large magnetodielectric effect was observed in HoMnO3 at low temperature where the dielectric constant can be tuned by an external magnetic field resulting in a decrease of up to 8% at 7\phantom\rule0.3em0exT. By comparing data for YMnO3 and HoMnO3 the contributions to the coupling between the dielectric response and Mn and Ho magnetic moments are separated.