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THE "IRREVERSIBILITY LINE" OF FLUORINE-DOPING Bi1.7Pb0.3Sr2Ca2Cu3Oy BULK SUPERCONDUCTOR

CAO XIAO-WEN FENG SHANG-SHEN GAO XIAO-HUI JIANG SHU-FEN WEI QIN

THE "IRREVERSIBILITY LINE" OF FLUORINE-DOPING Bi1.7Pb0.3Sr2Ca2Cu3Oy BULK SUPERCONDUCTOR

CAO XIAO-WEN, FENG SHANG-SHEN, GAO XIAO-HUI, JIANG SHU-FEN, WEI QIN
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  • Received Date:  09 April 1990
  • Published Online:  28 June 2005

THE "IRREVERSIBILITY LINE" OF FLUORINE-DOPING Bi1.7Pb0.3Sr2Ca2Cu3Oy BULK SUPERCONDUCTOR

  • 1. (1)中国科学院等离子体物理研究所,合肥,230031; (2)中南工业大学,长沙,410083

Abstract: The "irreversibility line" of high Tc fluorine-doping Bi(Pb)SrCaCuO(F) bulk superconductor has been studied experimentally. It is shown that there are different H*∝(l-t)3/2 relations in various regions of magnetic fields, namely, H*=1590(1-t)3/2 in the field region below 120 Oe and H*= 35700(1-t)3/2 -2480 in the region above 120 Oe. We think that the irreversibility lines in low field and in high field represent the behaviour of weak link and the grain superconductivity respectively. We note that H*(T) is substantially a melting line of the flux lattice. It is in the vortex lattice state below the "irreversibility line" H*(T) and in the vortex liquid state between H*(T) and H(c2) (T) curves.

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