2001/08/31 by Takashi Hotta, Elbio Dagotto, Fátima Cristina De Almeida Daniel · 2 citations
Arts and Humanities · Materials Science · Physics and Astronomy · Social Sciences · #Advanced Condensed Matter Physics #Cinema History and Criticism #Magnetic and transport properties of perovskites and related materials #Media, Gender, and Advertising #Physics of Superconductivity and Magnetism #Spanish Culture and Identity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.88.017201
published as Phys. Rev. Lett. 88, 017201 (2002). · 4 pages, Revtex, with 2 figures embedded in the text. Submitted to Phys. Rev. Lett
arxiv created 2001/08/31 · arxiv updated 2009/11/30 · openalex publication_date 2012/09/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/04/28
The key role of the orbital degree of freedom to understanding the magnetic properties of layered ruthenates is discussed based on the 3-orbital Hubbard model coupled to lattice distortions, using numerical and mean-field techniques. In the G-type antiferromagnetic phase of Ca(2)RuO(4), recent x-ray experiments reported 0.5 holes/site in the d(xy) orbital, while d(yz) and d(zx) orbitals contain 1.5 holes. This unexpected t(2g) hole distribution is explained by a novel orbital ordered (OO) state, stabilized by a combination of Coulombic and lattice effects. The phase diagram suggests the possibility of large magnetoresistance effects and a new ferromagnetic OO phase in ruthenates.