Transport properties of Co-Ni superlattices

We calculate the ballistic conductance G and the diffusive conductivity σ for Co-Ni superlattices grown in the (111) direction, with the intention of investigating the effect of the superlattice band structure on the electric transport properties. The calculation is carried out as a function of the...

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Autores principales: Weissmann, Mariana, Llois, Ana María
Publicado: 1996
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v54_n21_p15335_Weissmann
http://hdl.handle.net/20.500.12110/paper_01631829_v54_n21_p15335_Weissmann
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01631829_v54_n21_p15335_Weissmann
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spelling paper:paper_01631829_v54_n21_p15335_Weissmann2023-06-08T15:13:50Z Transport properties of Co-Ni superlattices Weissmann, Mariana Llois, Ana María We calculate the ballistic conductance G and the diffusive conductivity σ for Co-Ni superlattices grown in the (111) direction, with the intention of investigating the effect of the superlattice band structure on the electric transport properties. The calculation is carried out as a function of the number of atomic layers of each material, in the framework of the semiclassical approximation (Boltzmann's equation) and assuming that each spin component contributes independently. A Hubbard tight-binding Hamiltonian, solved in the unrestricted Hartree-Fock approximation and parametrized to fit bulk equilibrium values, is used to obtain the band structure in each case. We find that the presence of interfaces reduces the in plane and, more strongly, the perpendicular to the plane electric conduction, even when impurity scattering is disregarded. The results for G and σ show qualitative differences and thus, in the interpretation of the experiments, it is important to ascertain the precise nature of the transport regime. We do not find the oscillatory behavior of the conductivity as a function of the number of layers, found in recently reported experimental results. This certainly is not a matter of accuracy of the calculations and therefore rules out the hypothesis that the oscillatory behavior is due to simple band structure effects. Fil:Weissmann, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Llois, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1996 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v54_n21_p15335_Weissmann http://hdl.handle.net/20.500.12110/paper_01631829_v54_n21_p15335_Weissmann
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We calculate the ballistic conductance G and the diffusive conductivity σ for Co-Ni superlattices grown in the (111) direction, with the intention of investigating the effect of the superlattice band structure on the electric transport properties. The calculation is carried out as a function of the number of atomic layers of each material, in the framework of the semiclassical approximation (Boltzmann's equation) and assuming that each spin component contributes independently. A Hubbard tight-binding Hamiltonian, solved in the unrestricted Hartree-Fock approximation and parametrized to fit bulk equilibrium values, is used to obtain the band structure in each case. We find that the presence of interfaces reduces the in plane and, more strongly, the perpendicular to the plane electric conduction, even when impurity scattering is disregarded. The results for G and σ show qualitative differences and thus, in the interpretation of the experiments, it is important to ascertain the precise nature of the transport regime. We do not find the oscillatory behavior of the conductivity as a function of the number of layers, found in recently reported experimental results. This certainly is not a matter of accuracy of the calculations and therefore rules out the hypothesis that the oscillatory behavior is due to simple band structure effects.
author Weissmann, Mariana
Llois, Ana María
spellingShingle Weissmann, Mariana
Llois, Ana María
Transport properties of Co-Ni superlattices
author_facet Weissmann, Mariana
Llois, Ana María
author_sort Weissmann, Mariana
title Transport properties of Co-Ni superlattices
title_short Transport properties of Co-Ni superlattices
title_full Transport properties of Co-Ni superlattices
title_fullStr Transport properties of Co-Ni superlattices
title_full_unstemmed Transport properties of Co-Ni superlattices
title_sort transport properties of co-ni superlattices
publishDate 1996
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v54_n21_p15335_Weissmann
http://hdl.handle.net/20.500.12110/paper_01631829_v54_n21_p15335_Weissmann
work_keys_str_mv AT weissmannmariana transportpropertiesofconisuperlattices
AT lloisanamaria transportpropertiesofconisuperlattices
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