MESOSCOPIC PHENOMENA IN A DILUTE MAGNETIC SEMICONDUCTOR HG1-X-YCDYMNXTE

Microscopic four-contact probes to inversion layers adjacent to grain- boundaries of semimagnetic HgCdMnTe have been photolithographically pa tterned. Magnetoresistance measurements performed on these structures revealed aperiodic conductance fluctuations of the magnitude of the or der of e2/h. Analysis of both fluctuation amplitude and their mean per iod indicated that the studied system was in mesoscopic regime. Additi onally, strongly nonlinear current-voltage characteristics were detect ed in the vicinity of the spin-glass freezing occurring at T = 100 mK.