2007/04/30 by M. L. Plumer · 1 citation
Materials Science · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Antisymmetric relation #Condensed matter physics #Coupling (piping) #Hamiltonian (control theory) #Magnetic and transport properties of perovskites and related materials #Materials science #Mathematical physics #Mathematics #Multiferroics and related materials #Phase (matter) #Phase diagram #Physics #Quantum mechanics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.76.144411
7 pages, 9 figures
arxiv created 2007/07/04 · openalex publication_date 2007/10/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Biquadratic antisymmetric exchange terms of the form \ensuremath-[Cijeij^\ensuremathα(si\ifmmode×\else\texttimes\fisj)z]2, where eij is the unit vector connecting sites i and j and \ensuremathα=x,y, due partially to magnetoelectric coupling effects, are shown to be responsible for the spin-flop helical phase in CuFeO2 at low magnetic field and temperature. Usual biquadratic symmetric exchange, likely due to magnetoelastic coupling, is found to support the stability of axial magnetic states at higher fields in this nearly-Heisenberg-like stacked triangular antiferromagnet. A model Hamiltonian which also includes substantial interplane and higher-neighbor intraplane exchange interactions reproduces the unique series of observed commensurate and incommensurate periodicity phases with increasing applied magnetic field in this highly frustrated system. The magnetic-field--temperature phase diagram is discussed in terms of a Landau-type free energy.