Band-gap tuning and linear magnetoresistance in the silver chalcogenides.
Optimally doped silver selenide and silver telluride exhibit linear positive magnetoresistance over decades in magnetic field and on a scale comparable to the colossal magnetoresistance compounds. We use hydrostatic pressure to smoothly alter the band structure of Ag-rich and Ag-deficient samples of semiconducting Ag(2 +/-delta)Te of fixed stoichiometry and disorder. We find that the magnetoresistance spikes and the linear field dependence emerges when the bands cross and the Hall coefficient changes sign.
Lee
M
M
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.
Rosenbaum
T F
TF
Saboungi
M L
ML
Schnyders
H S
HS