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Magnetoresistance Related to on‐Site Spin Correlations in the Hopping Conductivity
Author(s) -
Agrinskaya N.V.,
Kozub V.I.,
Polyanskaya T.A.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(200003)218:1<159::aid-pssb159>3.0.co;2-g
Subject(s) - condensed matter physics , magnetoresistance , conductivity , electronic band structure , variable range hopping , metal–insulator transition , electrical resistivity and conductivity , spin (aerodynamics) , physics , materials science , quantum mechanics , magnetic field , thermodynamics
The role of the upper Hubbard band (D – band) in hopping conductivity is revised. An analysis of magnetoresistance in nearest neighbor hopping related to spin correlations in the D – band is given; the comparison of theoretical predictions both with original experimental data obtained for Ge:Sb samples and with existing experimental data unequivocally demonstrates the presence of a contribution of the D – band. A possible role of the D – band in metal–insulator transitions (MIT), in particular for recently observed MIT in 2D systems is discussed.