The magnetic properties in Bi$_2$Sr$_2$CaCu$_2$O$_8$ single crystal with columnar defects

  • Lee, C.W. (Department of Physics, Yeungnam University) ;
  • Shim, S.Y. (Korea Basic Science Institute) ;
  • Ha, D.H. (Korea Research Institute of Standards and Science) ;
  • Kim, D.H. (Department of Physics, Yeungnam University) ;
  • Lee, T.W. (Department of Physics, Yeungnam University)
  • Published : 2000.08.16

Abstract

We have studied the magnetic properties in Bi$_2$Sr$_2$CaCu$_2$O$_8$ single crystal with columnar defects using micro Hall-probe array. We found that fold profiles inside sample were similar to the Bean's critical state model from the magnetic hysteresis measurement. In the magnetic relaxation measurement, the normalized relaxation rates were maximum near the center and decreased toward the edge of the sample expect zero gauss. The relaxation rates as a function of the temperature were maximum near the 40K and rapidly decreased both sides of the peak.

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