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...
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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 ...
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We have observed, for the first time, magnetic excitations in a single crystal of thulium, using inelastic neutron spectroscopy. In the ferrimagnetic phase three modes with energies around 4 meV, 8 meV and 15 meV were clearly seen. We have considered our results in terms of crystal field level schemes for thulium. The rare earth metal thulium (hcp, electronic configuration 4f12) exhibits a part...
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When doping graphene an unique window appears in the electron–hole excitation spectrum. Including the Coulomb interaction through the Hubbard Hamiltonian results in bound state formation in graphene. The bound states we analyze represent triplet excitations, i.e. magnons, with spin 1. When increasing the strength of the Coulomb interaction, electron–hole pairs are dragged down into the window. ...
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We present a short review of the magnetic excitations in nanoparticles below the superparamagnetic blocking temperature. In this temperature regime, the magnetic dynamics in nanoparticles is dominated by uniform excitations, and this leads to a linear temperature dependence of the magnetization and the magnetic hyperfine field, in contrast to the Bloch T(3/2) law in bulk materials. The temperat...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2007
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.76.214434