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Europhysics Letters 93, 2 (2011) 27001
Remanence effects in the electrical resistivity of spin glasses
Thibaut Capron1, A. Perrat-Mabilon2, C. Peaucelle2, Tristan Meunier1, David Carpentier3, Laurent Lévy1, Christopher Bäuerle1, Laurent Saminadayar1

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.
1 :  NEEL - Institut Néel
2 :  IPNL - Institut de Physique Nucléaire de Lyon
3 :  Phys-ENS - Laboratoire de Physique de l'ENS Lyon
Physique/Matière Condensée/Systèmes mésoscopiques et effet Hall quantique
Mesoscopic transport – spin glass
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