2005/10/14 by Fusayoshi J. Ohkawa · 7 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Cuprate #Electron #Magnetic and transport properties of perovskites and related materials #Magnetic moment #Magnetism #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Superconductivity #Superexchange #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.74.3340
published in Journal of the Physical Society of Japan 74(12), 3340-3350 (Physical Society of Japan) · 27 pages, 10 figures (18 sub-figures). To be published in Journal of The Physical Society of Japan Vol.74 No.12 (2005)
arxiv created 2005/10/14 · openalex publication_date 2005/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A Kondo-lattice theory is applied to the crossover between local-moment magnetism for almost half fillings of electrons and itinerant-electron magnetism away from the half filling. In clean systems with no disorder, the bandwidth W^* of quasiparticles is non-zero and of the order of |J| at T=0K even in the limit of the half filling, with J the superexchange interaction constant between nearest neighbors. The so called Gutzwiller's term also contributes to W^* away from the half filling; it is approximately proportional to doping concentrations measured from the half filling. Magnetism is enhanced by disorder because the renormalization of W^* by J is reduced by disorder. The asymmetry of disorder between electron-doped and hole-doped cuprate oxide superconductors must be, at least partly, responsible for that of antiferromagnetic phases between them. The so called Kumagai phase is characterized as an SDW state in a disordered system rather than a spin glass. The Neel temperature TN about 300K of non-doped cuprate oxides can be explained by the reduction of TN by critical thermal antiferromagnetic fluctuations in quasi-two dimensions.