Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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The vortex dynamics in $Bi_2$$Sr_2$Ca$Cu_2$$O_8$single crystals unirradiated and with low-density columnar defect

저밀도 원통형 결함이 $Bi_2Sr_2CaCu_2O_8$ 단결정의 볼텍스 동역학에 미치는 영향

  • Lee, T.W. (Department of Physics, Yeungnam University) ;
  • 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)
  • 이태원 ;
  • 이창우 ;
  • 심성엽 ;
  • 하동한 ;
  • 김동호
  • Published : 2001.01.01
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Abstract

We have studied vortex dynamics in$ Bi_2$$Sr_2$$CaCu_2$O$_{8}$single crystals of unirradiated and irradiated samples by using 100 $\times$ $100\mu\textrm{m}^2$Hall sensor. Doses equivalent magnetic fields are 20 G, 100 G and 1 kG. In the magnetization measurement, a second magnetization peak (SMP) was observed in unirradiated, 20 G dose and 100 G dose samples in contrast to 1 kG dose sample. In the unirradiated sample, the SMP was observed in the range of 18 K ~ 35 K and the amplitude of the SMP decreased with increasing temperature. With increase of the irradiation dose, temperature region and sharpness of the SMP were reduced. In the magnetic relaxation measurement, we observed that the normalized relaxation rate S decreased with increasing the irradiation dose. Our results suggest that the vortex dynamics is not greatly affected by low-density columnar defects.s.

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