Zobrazeno 1 - 10
of 242
pro vyhledávání: '"Alascio, B."'
We report an unusual giant linear magnetostrictive effect in the ferrimagnet Gd$_{2/3}$Ca$_{1/3}$MnO$_3$ ($T_{c} \approx$80 K). Remarkably, the magnetostriction, negative at high temperature ($T \approx T_{c}$), becomes positive below 15 K when the m
Externí odkaz:
http://arxiv.org/abs/1109.0259
Autor:
Garcia, F. A., Garcia, D. J., Avila, M. A., Vargas, J. M., Pagliuso, P. G., Rettori, C., Passeggi, M. C. G., Oseroff, S. B., Schlottmann, P., Alascio, B., Fisk, Z.
Electron Spin Resonance (ESR) measurements performed on the filled skutterudite system Ce1-x$YbxFe4P12 (x< 0.003) unequivocally reveal the coexistence of two Yb3+ resonances, associated with sites of considerably different occupations and temperature
Externí odkaz:
http://arxiv.org/abs/1001.3287
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 study numerically the one-dimensional Kondo and Hund lattices consisting of localized spins interacting antiferro or ferromagnetically with the itinerant electrons, respectively. Using the Density Matrix Renormalization Group we find, for both mod
Externí odkaz:
http://arxiv.org/abs/cond-mat/0409332
This paper has been withdrawn by authors.
Comment: This paper has been withdrawn. You can view the latest version of this paper at arXiv:1109.0259
Comment: This paper has been withdrawn. You can view the latest version of this paper at arXiv:1109.0259
Externí odkaz:
http://arxiv.org/abs/cond-mat/0402297
Autor:
Ventura, C. I., Alascio, B.
Recently, based on the refined crystal structure of Pr0.6Ca0.4MnO3 from neutron diffraction, Daoud-Aladine et al.[PRL89,97205(2002)] have proposed a new ground state structure for the half-doped manganites R0.5Ca0.5MnO3, where R is a trivalent ion li
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303613
Autor:
Garcia, D. J., Hallberg, K., Batista, C. D., Capponi, S., Poilblanc, D., Avignon, M., Alascio, B.
Publikováno v:
Physical Review B 65, p. 134444 (2002)
We study numerically the one-dimensional ferromagnetic Kondo lattice. This model is widely used to describe nickel and manganese perovskites. Due to the competition between double and super-exchange, we find a region where the formation of magnetic p
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303292
Autor:
Aliaga, H., Causa, M. T., Tovar, M., Butera, A., Alascio, B., Vega, D., Leyva, G., Polla, G., Konig, P.
We present a study of the magnetic properties of the electron doped manganites Ca1-xYxMnO3 (for 0<=x<=0.25) in the paramagnetic regime. For the less doped samples (x<=0.1) the magnetic susceptibility, c(T), follows a Curie-Weiss (CW) law only for T >
Externí odkaz:
http://arxiv.org/abs/cond-mat/0211242
Publikováno v:
Physica B 320, 75 (2002).
Experimental evidence show that in the magnetoresistive manganite Ca_(1-x) Y_xMnO_3, ferromagnetic (FM) polarons arises in an antiferromagnetic (AF) background, as a result of the doping with Yttrium. This hypothesis is supported in this work by clas
Externí odkaz:
http://arxiv.org/abs/cond-mat/0108284
Publikováno v:
Phys. Rev. B 64, 092414 (2001)
We construct an effective Hamiltonian for the motion of electrons among the transition metal ions of ordered double perovskites like Sr2FeMoO6. in which strong intra-atomic Coulomb repulsion U is present in only one of the inequivalent transition met
Externí odkaz:
http://arxiv.org/abs/cond-mat/0105566