TY - JOUR
T1 - Kubo spins in nanoscale aluminum grains
T2 - A muon spin relaxation study
AU - Bachar, Nimrod
AU - Levy, Aviad
AU - Prokscha, Thomas
AU - Suter, Andreas
AU - Morenzoni, Elvezio
AU - Salman, Zaher
AU - Deutscher, Guy
N1 - Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/1/27
Y1 - 2020/1/27
N2 - 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, known as Kubo spins. The relaxation rate temperature dependence follows an activation law having an energy scale in agreement with the average level splitting. In weakly metallic films, inter-grain junction spins may contribute substantially to the smaller relaxation rate.
AB - 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, known as Kubo spins. The relaxation rate temperature dependence follows an activation law having an energy scale in agreement with the average level splitting. In weakly metallic films, inter-grain junction spins may contribute substantially to the smaller relaxation rate.
UR - http://www.scopus.com/inward/record.url?scp=85078787495&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.101.024424
DO - 10.1103/PhysRevB.101.024424
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AN - SCOPUS:85078787495
SN - 2469-9950
VL - 101
JO - Physical Review B
JF - Physical Review B
IS - 2
M1 - 024424
ER -