Remanence effects in the electrical resistivity of spin glasses

Details Remanence effects in the electrical resistivity of spin glasses Remanence effects in the electrical resistivity of spin glasses

2010-11-19

arxiv.org/abs/1011.4371v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We have measured the low temperature electrical resistivity of Ag : Mn mesoscopic spin glasses prepared by ion implantation with a concentration of 700 ppm. As expected, we observe a clear maximum in the resistivity (T ) at a temperature in good agreement with theoretical predictions. Moreover, we observe remanence effects at very weak magnetic fields for the resistivity below the freezing temperature Tsg: upon Field Cooling (fc), we observe clear deviations of (T ) as compared with the Zero Field Cooling (zfc); such deviations appear even for very small magnetic fields, typically in the Gauss range. This onset of remanence for very weak magnetic fields is reminiscent of the typical signature on magnetic susceptibility measurements of the spin glass transition for this generic glassy system.

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