Magnetoconductance noise and irreversibilities in submicron wires of spin-glass n-CdMnTe
J. Jaroszynski, J. Wrobel, G. Karczewski, T. Wojtowicz, and T. Dietl, (Institute of Physics, Polish Academy of Science, Warsaw)
TL;DR
This paper investigates magnetoconductance noise and irreversibilities in submicron CdMnTe spin-glass wires at millikelvin temperatures, revealing signatures of spin-glass freezing and supporting the droplet model.
Contribution
It provides experimental evidence of spin-glass behavior in mesoscopic wires and links conductance noise features to the droplet model of spin-glasses.
Findings
Detection of 1/f conductance noise indicating spin-glass freezing
Observation of universal conductance fluctuations recovery
Identification of magnetic and thermal irreversibilities
Abstract
Signatures of spin-glass freezing such as the appearance of 1/f conductance noise, the recovery of universal conductance fluctuations, aging, as well as magnetic and thermal irreversibilities are detected in mesoscopic wires of CdMnTe:I at millikelvin temperatures. Spectral characteristics of conductance time series are consistent with the droplet model of short-range spin-glasses.
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