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

Lihong Wang; Yun Zhu; Hui Lin Zhao; Shechao Feng

doi:10.1103/PhysRevLett.64.3094

← Back to search

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

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

DOI 10.1103/PhysRevLett.64.3094 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown
Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	125	Pressure not reported	unknown