The Righi-Leduc effect has been measured for n-type InSb crystals of various mobilities and was found to increase with temperature in a manner to indicate that the unipolar contribution is prevalent over the bipolar part of the effect. The experimental values measured over the temperature range between 25°C and 300°C agree well with
Putley's theory. The Righi-Leduc coefficient was also determined as a function of the magnetic field and the strong decrease observed is explained in terms of the magnetoresistance.
Dedicated to Prof. Dr. R.Hilsch on the occasion of his 60th birthday.
The author wishes to acknowledge the help of Mrs.Claire Loscoe Burke during the experiments and in reviewing the manuscript.