Magnetic dephasing in mesoscopic spin glasses

Thibaut Capron (1) , Guillaume Forestier (1) , Angela Perrat-Mabilon (2) , Christophe Peaucelle (2) , Tristan Meunier (1) , Christopher Bäuerle (1) , Laurent Lévy (1) , David Carpentier (3) , Laurent Saminadayar (4)

1 NEEL - QuantECA - Circuits électroniques quantiques Alpes
2 IPNL - Institut de Physique Nucléaire de Lyon
3 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
4 NEEL - TPS - Thermodynamique et biophysique des petits systèmes

We have measured Universal Conductance Fluctuations in the metallic spin glass Ag:Mn as a function of temperature and magnetic field. From this measurement, we can access the phase coherence time of the electrons in the spin glass. We show that this phase coherence time increases with both the inverse of the temperature and the magnetic field. From this we deduce that decoherence mechanisms are still active even deep in the spin glass phase.

Keywords: Conductance Fluctuations; Dephasing; Spin Glass; Mesoscopic Transport

Domains: Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]

Thibaut Capron, Guillaume Forestier, Angela Perrat-Mabilon, Christophe Peaucelle, Tristan Meunier, et al.. Magnetic dephasing in mesoscopic spin glasses. Physical Review Letters, 2013, 111, pp.187203. ⟨10.1103/PhysRevLett.111.187203⟩. ⟨ensl-00806023⟩