Magnetic pyrochlore oxides
نویسندگان
چکیده
منابع مشابه
Magnetic pyrochlore oxides
Within the past 20 years or so, there has occurred an explosion of interest in the magnetic behavior of pyrochlore oxides of the type A 2 B 4+ 2 O7 where A is a rare-earth ion and B is usually a transition metal. Both the A and B sites form a network of corner-sharing tetrahedra which is the quintessential framework for a geometrically frustrated magnet. In these systems the natural tendency to...
متن کاملFrustrated pyrochlore oxides, Y2Mn2O7, Ho2Mn2O7, and Yb2Mn2O7: Bulk magnetism and magnetic microstructure.
The bulk magnetic properties, including dc and ac susceptibilities and heat capacity, of the pyrochlore oxides Ho2Mn2O7 and Yb2Mn2O7 are reported and compared with those of the previously studied Y2Mn2O7 . In the latter case the magnetic Mn ions occupy the 16c sites in Fd3m which define a potentially frustrated three-dimensional array of corner sharing tetrahedra. For Ho2Mn2O7 and Yb2Mn2O7 magn...
متن کاملMonte Carlo Study of the Pyrochlore Double-Exchange Model –Frustration Effects in Molybdenum Pyrochlore Oxides–
where t is the transfer integral for nearest-neighbor sites hiji on the pyrochlore lattice, JH represents the Hund’s-rule coupling between the itinerant electron spin ~si and the localized spin ~ Si, while JAF is the super-exchange antiferromagnetic interaction between the neighboring localized spins. The first two terms induce the double-exchange ferromagnetic interactions through the kinetic ...
متن کاملAnisotropy-Tuned Magnetic Order in Pyrochlore Iridates.
The magnetic behavior of polycrystalline samples of Er(2)Ir(2)O(7) and Tb(2)Ir(2)O(7) pyrochlores is studied by magnetization measurements and neutron diffraction. Both compounds undergo a magnetic transition at 140 and 130 K, respectively, associated with an ordering of the Ir sublattice, signaled by thermomagnetic hysteresis. In Tb(2)Ir(2)O(7), we show that the Ir molecular field leads the Tb...
متن کامل1 Introduction to Magnetic Oxides
Oxides are ubiquitous. The Earth’s crust and mantle are largely made up of compounds of metal cations and oxygen anions. Looking at the composition of the crust in Figure 1.1, we see that oxygen is the most abundant element and the most common metals are aluminum and silicon. Most rocks are therefore aluminosilicates. The next most abundant element, and the only transition metal other than tita...
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ژورنال
عنوان ژورنال: Reviews of Modern Physics
سال: 2010
ISSN: 0034-6861,1539-0756
DOI: 10.1103/revmodphys.82.53