2005/01/31 by O. P. Vajk, M. Kenzelmann, J. W. Lynn +3 · 7 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Antiferromagnetism #Chemistry #Condensed matter physics #Crystallography #Dielectric #Ferroelectricity #Heisenberg model #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #Optics #Order (exchange) #Phase (matter) #Phase diagram #Physics #Quantum mechanics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.94.087601
To be published in Physical Review Letters
arxiv created 2005/01/31 · openalex publication_date 2005/03/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
Hexagonal HoMnO3 is a frustrated antiferromagnet (TN=72 K) ferroelectric (TC=875 K) in which these two order parameters are coupled. Our neutron measurements of the spin-wave dispersion for the S=2 Mn3+ on the layered triangular lattice are well described by a two-dimensional nearest-neighbor Heisenberg exchange J=2.44 meV, and an anisotropy D that is 0.28 meV above the spin-reorientation transition at 40 K and 0.38 meV below. For H\ensuremath∥c the magnetic structures and phase diagram have been determined, and reveal additional transitions below 8 K where the ferroelectrically displaced Ho3+ ions are ordered magnetically.