Hysteretic magnetotransport in p-type AlxGa1-xAs heterostructures with In/Zn/Au ohmic contacts

B. Grbic , R. Leturcq (1) , T. Ihn , K. Ensslin , G. Blatter , D. Reuter , A.D. Wieck

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520

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.

Domaines: Physique [physics]

B. Grbic, R. Leturcq, T. Ihn, K. Ensslin, G. Blatter, et al.. Hysteretic magnetotransport in p-type AlxGa1-xAs heterostructures with In/Zn/Au ohmic contacts. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2008, 77, pp.245307-1-4. ⟨10.1103/PhysRevB.77.245307⟩. ⟨hal-00357350⟩