MAGNETIC AND TRANSPORT SIGNATURES OF RASHBA SPIN-ORBIT COUPLING ON THE FERROMAGNETIC KONDO LATTICE MODEL IN TWO DIMENSIONS

GIOVANY MEZA; JOSE RIERA

Buenos Aires

Conferencia; 27th International Conference on Low Temperature Physics; 2014

International Union of Pure and Applied Physics, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Agencia Nacional de Promoción Cientifica y Tecnológica

Motivated by emergent phenomena at oxide surfaces and interfaces,particularly those involving transition metal oxides with perovskitecrystal structure such as LaTiO3/SrTiO3, we examine the ferromagnetic Kondo lattice model (FKLM) or double-exchange model in the presence of a Rashba spin-orbit coupling (RSOC). Using numerical techniques under the assumption that the electrons on localized orbitals may be treated as classical continuum spins, we compute various charge, spin and transportproperties on square clusters at zero temperature. We find that themain effect of the RSOC is the destruction of the ferromagnetic statepresent in the FKLM at low electron fillings, with the consequent suppression of conductivity. In addition, near half-filling the RSOCleads to a departure of the antiferromagnetic state of the FKLM witha consequent reduction to the intrinsic tendency to electronic phaseseparation. The same model can be used to study at an effective level the combined effect on magnetic and transport properties of Rashba andferromagnetic moments, such as the ones present at LaMnO3/SrMnO3interfaces.