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    Theory of 1/f magnetic flux noise in high-Tc superconductors

    Lihong Wang, Yun Zhu, Hui Lin Zhao, and Shechao Feng

    • Solid State Science Center, Department of Physics University of California, Los Angeles, Los Angeles, California 90024

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    Phys. Rev. Lett. 64, 3094 – Published 18 June, 1990

    DOI: https://doi.org/10.1103/PhysRevLett.64.3094

    Abstract

    A theoretical model is proposed to explain the magnitude of excess 1/f magnetic flux noise in high-Tc superconducting SQUID’s. Based on a model for 1/f noise generation due to the multiple elastic scattering of quasiparticles with disordered mobile vortices, we show that the 1/f flux noise magnitude has the following features: It increases with T below Tc, sharply falls off with T above Tc, and decreases with an increasing energy gap. Its magnetic-field dependence is also shown to be inversely proportional to the square of the voltage-to-flux transfer function. Our results are shown to be in good agreement with recent experimental measurements.

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    Phys. Rev. Lett. 64, 3094– Published 18 June, 1990
    • Received 14 December 1989

    © 1990 American Physical Society

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