2014/08/28 by Hiroaki Ishizuka, Leon Balents · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Ferromagnetism #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetism #Magnetization #Materials science #Orthorhombic crystal system #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Tetragonal crystal system #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.90.184422
published as Phys. Rev. B 90, 184422 (2014) · 18 pages, 12 figures
arxiv created 2014/08/28 · openalex publication_date 2014/11/20 · arxiv updated 2014/12/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study magnetism of a fcc lattice spin model with tetragonal distortions, with general exotic directional magnetic interactions allowed by symmetry. We consider two models, corresponding to a uniform tetragonal distortion, or a two-sublattice model with a tetragonal screw axis. We establish their low-temperature phase diagrams in the semiclassical limit using classical optimization and consideration of fluctuations both analytically and by Monte Carlo simulation. We found that both order-by-disorder and exchange-anisotropy mechanisms favor a \ensuremath⟨110\ensuremath⟩ easy axis for magnetization. We also show that spin-lattice coupling can give rise to an intermediate temperature paramagnetic nematic/orthorhombic phase, and discuss the transitions to/from this state. These results are relevant to a family of insulating magnetic double perovskites, and find immediate application to the ferromagnet Ba2NaOsO6.