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Temperature dependent flux-locked loop noise measurements have been performed on low-noise integrated multiloop pickup coil magnetometers using ramp-type Josephson junctions with PrBa2Cu3O7 barriers. We show that the noise properties of such multilayer devices depend on the epitaxy of the YBa2Cu3O7 top film as analyzed by micro-Raman spectroscopy. At high epitaxial film quality the low-frequency noise is dominated solely by fluctuations of the critical currents of the Josephson junctions and is suppressible by additional bias-current modulation. The noise and the epitaxial properties of different samples are correlated to details in the laser-deposition process of the insulating SrTiO3 layer.
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Scharnweber et al. (1997) studied this question.
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