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Kubo spins in nano-scale aluminum grains: A muon spin relaxation study

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arxiv 1803.03177 v1 pith:HOI7DYPD submitted 2018-03-08 cond-mat.str-el cond-mat.other

Nimrod Bachar , Aviad Levy , Thomas Prokscha , Andreas Suter , Elvezio Morenzoni , Zaher Salman , Guy Deutscher This is my paper · ORCID
classification cond-mat.str-elcond-mat.other
keywords relaxationgrainsratefilmshavingspintemperaturealuminum
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We report muon spin relaxation rate measurements on films composed of aluminum grains having a size of a few nm, with a large energy level splitting of the order of 100 K. The films range from weakly metallic to insulating. In the insulating case the low temperature relaxation rate is consistent with the presence of single electron spins in grains having an odd number of electrons. The relaxation rate temperature dependence follows an activation law having an energy scale in agreement with the average level splitting. In weakly metallic films the relaxation rate is smaller and decreases faster with temperature. Overall our observations are in line with the presence of a Kubo spin in Al nano-size grains due to quantum size effects.

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