Hysteretic magnetotransport in p-type AlGaAs heterostructures with In/Zn/Au ohmic contacts
B. Grbic, R. Leturcq, T. Ihn, K. Ensslin, G. Blatter, D. Reuter, A. D., Wieck
TL;DR
This study investigates hysteretic magnetotransport in p-type AlGaAs heterostructures with In/Zn/Au contacts, revealing hysteresis behavior linked to contact properties and potential superconductivity effects.
Contribution
It reports the observation of hysteresis in magneto-conductance and explores its possible connection to superconductivity in ohmic contacts, a novel insight in this material system.
Findings
Hysteresis in conductance disappears above 0.5 T and 300 mK.
Pronounced dip in magneto-conductance below 10 mT.
Hysteresis possibly related to superconductivity in contacts.
Abstract
The two-terminal magneto-conductance of a hole gas in C-doped AlGaAs/GaAs heterostructures with ohmic contacts consisting of alloyed In/Zn/Au displays a pronounced hysteresis of the conductance around zero magnetic field. The hysteresis disappears above magnetic fields of around 0.5 T and temperatures above 300 mK. For magnetic fields below 10 mT we observe a pronounced dip in the magneto-conductance. We tentatively discuss these experimental observations in the light of superconductivity of the ohmic contacts.
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