1994
DOI: 10.1007/bf00755416
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Magnetic flux noise in copper oxide superconductors

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Cited by 98 publications
(59 citation statements)
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“…Recently, Yoshihara et al [5] showed that l/f flux noise with Critical current fluctuations in Josephson junctions have been widely studied, for example [6][7][8], and are understood to arise from the trapping and release of electrons in traps in the tunnel barrier. In the case of high transition temperatures (T c ) SQUIDs at 77 K, l/f flux noise is ascribed to thermal activation of vortices among pinning sites [9]. This noise can be eliminated by reducing the linewidth to below (Φ 0 /B) 1/2 , thereby making it energetically unfavorable for the film to trap a vortex [10]; B is the magnetic field in which the device is cooled.…”
mentioning
confidence: 99%
“…Recently, Yoshihara et al [5] showed that l/f flux noise with Critical current fluctuations in Josephson junctions have been widely studied, for example [6][7][8], and are understood to arise from the trapping and release of electrons in traps in the tunnel barrier. In the case of high transition temperatures (T c ) SQUIDs at 77 K, l/f flux noise is ascribed to thermal activation of vortices among pinning sites [9]. This noise can be eliminated by reducing the linewidth to below (Φ 0 /B) 1/2 , thereby making it energetically unfavorable for the film to trap a vortex [10]; B is the magnetic field in which the device is cooled.…”
mentioning
confidence: 99%
“…Pronounced asymmetry in the background noise variance at distinct telegraph levels has subsequently been observed by us in the voltage noise of current biased HTSC thin films [16]. The appearance of quiet and noisy telegraph states was tentatively interpreted as a signature of vortex hopping from a site where it is relatively mobile to a site where it is much more restricted spatially [5]. This assumption imposes strong conditions on the model of an active two-level fluctuator by requiring the TLF energy wells to have different curvature.…”
Section: Introductionmentioning
confidence: 75%
“…This phenomenon was first observed in flux noise experiments performed at zero field cooled HTSC samples and since then is referred to as "noisy and quiet metastable states" [5]. Pronounced asymmetry in the background noise variance at distinct telegraph levels has subsequently been observed by us in the voltage noise of current biased HTSC thin films [16].…”
Section: Introductionmentioning
confidence: 94%
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