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Low‐Temperature Magnetoresistance in Medium‐Angle Grain Boundaries in Germanium
Author(s) -
Xia YiBen,
Bangert E.,
Landwehr G.
Publication year - 1987
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.2221440218
Subject(s) - grain boundary , germanium , condensed matter physics , magnetoresistance , materials science , thermal conduction , atmospheric temperature range , activation energy , liquid helium , magnetic field , acceptor , tilt (camera) , field (mathematics) , helium , chemistry , thermodynamics , atomic physics , physics , microstructure , metallurgy , geometry , organic chemistry , mathematics , quantum mechanics , silicon , pure mathematics , composite material
Magneto‐transport properties of grain boundaries in germanium bicrystals are studied in the liquid helium temperature range. For samples with 7° and 8° tilt angle an exponential magnetic field dependence is observed, which is analyzed in terms of two‐dimensional hopping conduction. The acceptor concentration N in the grain boundary can be deduced by comparing different magnetic field orientations. A surprising temperature dependence of N is obtained. In addition, the activation energy is determined as about 0.5 meV, typical for the hopping process, and decreases slightly with increasing magnetic field.