We present an experimental technique to generate and measure a temperature
bias in the quantum Hall effect of GaAs/AlGaAs Corbino samples. The bias is
generated by injecting an electrical current at a central resistive heater and
the resulting radial temperature drop is determine by local measurements of the
conductance between internal and external concentric rings. The experimental
results are in agreement with the predictions of numerical simulations of the
heat flow through the substrate. We also compare these results with previous
predictions based on the thermoelectric response of these devices.Comment: 6 pages, 5 figure