TY - JOUR
T1 - Mott transition in granular aluminum
AU - Bachar, N.
AU - Lerer, S.
AU - Levy, A.
AU - Hacohen-Gourgy, S.
AU - Almog, B.
AU - Saadaoui, H.
AU - Salman, Z.
AU - Morenzoni, E.
AU - Deutscher, G.
N1 - Publisher Copyright:
©2015 American Physical Society
PY - 2015/1/29
Y1 - 2015/1/29
N2 - A Mott transition in granular Al films is observed by probing the increase of the spin-flip scattering rate of conduction electrons as the nanosize metallic grains are being progressively decoupled. The presence of free spins in granular Al films is directly demonstrated by μSR measurements. Analysis of the magnetoresistance in terms of an effective Fermi energy shows that it becomes of the order of the grains electrostatic charging energy at a room temperature resistivity ρ300K≈50000μΩcm, at which a metal to insulator transition is known to exist. As this transition is approached the magnetoresistance exhibits a heavy-fermion-like behavior, consistent with an increased electron effective mass.
AB - A Mott transition in granular Al films is observed by probing the increase of the spin-flip scattering rate of conduction electrons as the nanosize metallic grains are being progressively decoupled. The presence of free spins in granular Al films is directly demonstrated by μSR measurements. Analysis of the magnetoresistance in terms of an effective Fermi energy shows that it becomes of the order of the grains electrostatic charging energy at a room temperature resistivity ρ300K≈50000μΩcm, at which a metal to insulator transition is known to exist. As this transition is approached the magnetoresistance exhibits a heavy-fermion-like behavior, consistent with an increased electron effective mass.
UR - http://www.scopus.com/inward/record.url?scp=84922263815&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.91.041123
DO - 10.1103/PhysRevB.91.041123
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AN - SCOPUS:84922263815
SN - 1098-0121
VL - 91
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 4
M1 - 041123
ER -