ELECTRON HEATING EXPERIMENTS BELOW THE SPIN-GLASS RESISTANCE MAXIMUM

We report electron heating measurements below the resistance maximum a ssociated with the spin-glass freezing transition. The differential re sistance showed features under the application of a dc electric field which cannot be readily interpreted in a simple electron heating pictu re. We demonstrate that these anomalies are resolved after computation of the resistance by integration of the differential results at vario us currents. An experiment was designed and carried out to test this p rocedure through the use of an applied magnetic field. The integration process is applicable to transport measurements carried out under com binations of ac and dc electric fields.