Origin of 1/f noise peaks of YBa{sub 2}Cu{sub 3}O{sub x} films in a magnetic field

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The temperature and magnetic field dependence of 1/f noise has been measured in epitaxial YBa{sub 2}Cu{sub 3}O{sub x} films. In a magnetic field, two noise peaks were observed as temperature decreases; one at higher temperature was found to match the thermal fluctuation of the sample resistance and the other near the foot of the transition was found to be magnetic-field dependent. The location of the latter was shifted toward low temperature and the peak height was decreased as a magnetic field increased. In a zero field only one peak from the resistance fluctuation was observed. We show that the field-dependent ... continued below

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18 p.

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Kang, W.N.; Kim, D.H. & Park, J.H. February 1, 1994.

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  • Kang, W.N.
  • Kim, D.H.
  • Park, J.H. Korea Institute of Science and Technology, Seoul (Korea, Democratic People`s Republic of). Applied Physics Group

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Description

The temperature and magnetic field dependence of 1/f noise has been measured in epitaxial YBa{sub 2}Cu{sub 3}O{sub x} films. In a magnetic field, two noise peaks were observed as temperature decreases; one at higher temperature was found to match the thermal fluctuation of the sample resistance and the other near the foot of the transition was found to be magnetic-field dependent. The location of the latter was shifted toward low temperature and the peak height was decreased as a magnetic field increased. In a zero field only one peak from the resistance fluctuation was observed. We show that the field-dependent noises are due to flux motion interacting with the pinning potential. A classical model is used to explain the field-induced noise peaks. We interpret that the temperature dependences of the flux bundle size and the sample resistance are the reasons for the noise peaks, and a rough estimation of the temperature and field dependence of the flux bundle size is presented. Any possible relationship between the noise peaks and the flux-line-lattice phase transition is also discussed.

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18 p.

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OSTI as DE95013495

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  • Other Information: PBD: Feb 1994

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  • Other: DE95013495
  • Report No.: ANL/MSD/PP--82476
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/79036 | External Link
  • Office of Scientific & Technical Information Report Number: 79036
  • Archival Resource Key: ark:/67531/metadc717872

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  • February 1, 1994

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  • Sept. 29, 2015, 5:31 a.m.

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  • Aug. 23, 2016, 3:13 p.m.

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Kang, W.N.; Kim, D.H. & Park, J.H. Origin of 1/f noise peaks of YBa{sub 2}Cu{sub 3}O{sub x} films in a magnetic field, report, February 1, 1994; Illinois. (digital.library.unt.edu/ark:/67531/metadc717872/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.