Premium
Theory of the diffusivity—mobility ratio in cadmium arsenide
Author(s) -
Singh M.,
Leotin J.,
Wallace P. R.
Publication year - 1983
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/pssb.2221150112
Subject(s) - anisotropy , thermal diffusivity , condensed matter physics , magnetic field , gallium arsenide , einstein relation , crystal (programming language) , field (mathematics) , materials science , single crystal , cadmium , physics , nuclear magnetic resonance , thermodynamics , optics , quantum mechanics , mathematics , computer science , programming language , metric (unit) , operations management , metallurgy , pure mathematics , economics
Stimulated by the work of Chakravarti et al. [1], the theory of the Einstein relation for the ratio of diffusivity, D , to mobility, μ, in cadmium arsenide crystals in a magnetic field at low temperatures is developed. D /μ shows characteristic de Haas‐Shubnikov oscillations which vary considerably with orientation of the crystal due to its anisotropy. In fact, for low enough magnetic fields it is shown that it may oscillate as a function of the angle θ between the c ‐axis of the crystal and the field direction. Measurements of D /μ would thus constitute a sensitive test of anisotropy. By measuring the variation both, with respect to field and angle for a single sample, all the band parameters can be determined in principle.