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pro vyhledávání: '"Allub, R."'
CaCu$_3$Fe$_4$O$_{12}$ exhibits a temperature-induced transition from a ferrimagnetic-insulating phase, in which Fe appears charge disproportionated, as Fe$^{3+}$ and Fe$^{5+}$, to a paramagnetic-metallic phase at temperatures above 210 K, with Fe$^{
Externí odkaz:
http://arxiv.org/abs/1804.05726
Autor:
Allub, R.
We study the zero-bandwidth limit of the two-impurity Anderson model in an antiferromagnetic (AF) metal. We calculate, for different values of the model parameters, the lowest excitation energy, the magnetic correlation $<\mathbf{S}_{1}\mathbf{S}_{2}
Externí odkaz:
http://arxiv.org/abs/0809.3253
We study the effect of Coulomb interactions in transition metal oxides junctions. In this paper we analyze charge transfer at the interface of a three layer ferromagnetic-paramagnetic-ferromagnetic metallic oxide system. We choose a charge model cons
Externí odkaz:
http://arxiv.org/abs/0809.2984
We present a simple model to study the electron doped manganese perovskites. The model considers the competition between double exchange mechanism for itinerant electrons and antiferromagnetic superexchange interaction for localized electrons. It rep
Externí odkaz:
http://arxiv.org/abs/cond-mat/9804248
Autor:
Allub, R., Alascio, B.
We use a model previously formulated based on the double exchange mechanism and diagonal disorder to calculate magnetization and conductivity for La_{1-x}Sr_xMnO_3 type crystals as a function of temperature. The model represents each Mn^{4+} ion by a
Externí odkaz:
http://arxiv.org/abs/cond-mat/9608086
Autor:
Allub, R., Alascio, B.
We study a simplified model of the electronic structure of compounds of the type of La$_{1-x}$Sr$_x$MnO$_3$. The model represents each Mn$^{4+}$ ion by a spin S=1/2, on which an electron can be added to produce Mn$^{3+}$. We include two strong intrat
Externí odkaz:
http://arxiv.org/abs/cond-mat/9606093
Autor:
Allub, R.
Publikováno v:
In Physica B: Physics of Condensed Matter 15 July 2013 421:34-40
Publikováno v:
Journal of Applied Physics; 2018, Vol. 124 Issue 4, pN.PAG-N.PAG, 9p, 1 Diagram, 11 Graphs
Publikováno v:
In Physica B: Physics of Condensed Matter 2002 320(1):13-17
Publikováno v:
In Journal of Magnetism and Magnetic Materials 1999 196:522-524