Magnetic-field-dependent quasiparticle energy relaxation in mesoscopic wires

Details Magnetic-field-dependent quasiparticle energy relaxation in mesoscopic wires Magnetic-field-dependent quasiparticle energy relaxation in mesoscopic wires

2003-01-07

arxiv.org/abs/cond-mat/0301070v1

Phys. Rev. Lett. 90, 076806 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.90.076806

In order to find out if magnetic impurities can mediate interactions between quasiparticles in metals, we have measured the effect of a magnetic field B on the energy distribution function f(E) of quasiparticles in two silver wires driven out-of-equilibrium by a bias voltage U. In a sample showing sharp distributions at B=0, no magnetic field effect is found, whereas in the other sample, rounded distributions at low magnetic field get sharper as B is increased, with a characteristic field proportional to U. Comparison is made with recent calculations of the effect of magnetic-impurities-mediated interactions taking into account Kondo physics.

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