SPIN-POLARONS IN AN EXCHANGE MODEL
Por:
Navarro O., Vallejo E., Avignon M.
Publicada:
10 abr 2012
Resumen:
Spin-polarons are obtained using an Ising-like exchange model consisting of double and super-exchange interactions in low-dimensional systems. At zero temperature, a new phase separation between small magnetic polarons, one conduction electron self-trapped in a magnetic domain of two or three sites, and the antiferromagnetic phase was previously reported. On the other hand the important effect of temperature was missed. Temperature diminishes Boltzmann probability allowing excited states in the system. Static magnetic susceptibility and short-range spin-spin correlations at zero magnetic field were calculated to explore the spin-polaron formation. At high temperature Curie-Weiss behavior is obtained and compared with the Curie-like behavior observed in the nickelate one-dimensional compound Y2-nCanBaNiO5.
Filiaciones:
Navarro O.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Vallejo E.:
Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Coahuila, Carretera Torreón-Matamoros, C.P. 27276 Torreón, Coahuila, Mexico
Avignon M.:
Institut Néel, CNRS, Université Joseph Fourier, Boite Postale 166, 38042 Grenoble, France
All Open Access; Green
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