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The two-terminal magneto-conductance of a hole gas in C-doped AlGaAs/GaAsheterostructures with ohmic contacts consisting of alloyed In/Zn/Au displays apronounced hysteresis of the conductance around zero magnetic field. Thehysteresis disappears above magnetic fields of around 0.5 T and temperaturesabove 300 mK. For magnetic fields below 10 mT we observe a pronounced dip inthe magneto-conductance. We tentatively discuss these experimental observationsin the light of superconductivity of the ohmic contacts.

Hysteretic magnetotransport in p-type AlGaAs heterostructures with In/Zn/Au ohmic contacts