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Author (up) H. Pastoriza, M. F. Goffman, A. Arribére, and F. de la Cruz openurl 
  Title Phase diagram of the mixed state of Bi$2$Sr$2$CaCu$_2$O8-? single crystals: first order phase transition at the irreversibility line Type Journal Article
  Year 1994 Publication Physica C Abbreviated Journal  
  Volume 235-240 Issue Pages 2579-2580  
  Abstract Magnetization and susceptibility measurements show a first order phase transition in the magnetic flux structure at the irreversibility line of Bi$2$Sr$2$CaCu$8$ single crystals, in the field range $0 < H < 360$ Oe. The resistivity in the c direction drops six orders of magnitude in less that 0.1 K, and there is a discontinuous change in the magnetization at the same temperature. The change in magnetization together with the Clausius-Clapeyron equation gives a variation of entropy of 0.06kB per vortex layer, at the transition. Above 360 Oe the previous $H-T$ phase diagram is determined by the laminar nature of superconductivity and the irreversibility line is frequency dependent.  
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  Call Number BT @ hernan @ pastoriza94c Serial 32  
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