منابع مشابه
Orbital ordering and structural distortions in vanadium spinels
Materials with the spinel crystal structure exhibit a diverse range of ground states and properties. These result from the interplay of spin, charge and orbital degrees of freedom over the geometrically frustrated pyrochlore sublattice. In certain spinels the interaction of ordered orbitals induces a structural distortion, due to the formation of clusters of directly bonded atoms called orbital...
متن کاملMagnetic Order in Li-Mn Spinels
Magnetic measurements were carried out on different samples of Lithium-Manganese spinel LiMn 20 4 , great care having been taken to avoid the presence of spurious magnetic phases, such as Mn 3 0 4 . Susceptibility data, showing deviations from paramagnetic behaviour at about 40 K, were analyzed in terms of local magnetic interactions, taking into account the structural and transport properties ...
متن کاملMulti-orbital effects in optical properties of vanadium sesquioxide.
Vanadium sesquioxide, V(2)O(3), boasts a rich phase diagram whose description necessitates accounting for many-body Coulomb correlations. The spectral properties of this compound have been successfully addressed within dynamical mean field theory to the extent that results of recent angle-resolved photoemission experiments have been correctly predicted. While photoemission spectroscopy probes t...
متن کاملOrbital order driven quantum criticality
Charge, spin, and orbital degrees of freedom underlie the physics of transition metal compounds. Much work has revealed quantum critical points associated with spin and charge degrees of freedom in many of these systems. Here we illustrate that the simplest models that embody the orbital degrees of freedom the twoand three-dimensional quantum orbital compass models exhibit an exact quantum crit...
متن کاملIncipient orbital order in half-metallic Ba2FeReO6.
Largely unquenched Re 5d orbital magnetic moments in half-metallic Ba2FeReO6 drive a symmetry lowering transition from a cubic paramagnet to a compressed tetragonal (c/a < 1) ferrimagnet below Tc ~ 305 K, with a giant linear magnetoelastic constant and the spins lying spontaneously along the unique tetragonal axis. The large orbital magnetization and degree of structural deformation indicate pr...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2005
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.72.020408