MAGNETIC-FIELD DEPENDENCE OF THERMAL CONDUCTIVITY MEASURED BY A CORBINO-DISK METHOD.
SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY RAPID CITY DEPT OF PHYSICS
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When heat flow due to charged carriers is radial in a thin cylindrical sample, a magnetic field applied parallel to the cylinder axis has maximum effect in reducing the thermal conductivity K because this Corbino-disk geometry prevents formation of a transverse temperature gradient. When a magnetic field is applied the method measures directly isothermal K longitudinal-flow methods are likely to give approximately the adiabatic K. Measurements were made in the range 70-250C on n-InSb with fields 1000-8000 gauss. Maximum total change in K was -4, somewhat smaller in magnitude than expected. The discrepancy may be due to lower electron mobility and to the difference in the directions of heat flow and sample growth. Author