Electron Glass in Ultrathin Granular Al Films at Low Temperatures

Details Electron Glass in Ultrathin Granular Al Films at Low Temperatures Electron Glass in Ultrathin Granular Al Films at Low Temperatures

2000-07-28

arxiv.org/abs/cond-mat/0007474v4

Phys. Rev. Lett. 87, 256601 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX 3.1, 4 pages, 4 figures (EPS files) (Minor Additions)

Scientific paper

10.1103/PhysRevLett.87.256601

Quench-condensed granular Al films, with normal-state sheet resistance close to 10 k$\Omega/\Box$, display strong hysteresis and ultraslow, non-exponential relaxation in the resistance when temperature is varied below 300 mK. The hysteresis is nonlinear and can be suppressed by a dc bias voltage. The relaxation time does not obey the Arrhenius form, indicating the existence of a broad distribution of low energy barriers. Furthermore, large resistance fluctuations, having a 1/f-type power spectrum with a low-frequency cut-off, are observed at low temperatures. With decreasing temperature, the amplitude of the fluctuation increases and the cut-off frequency decreases. These observations combine to provide a coherent picture that there exists a new glassy electron state in ultrathin granular Al films, with a growing correlation length at low temperatures.

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