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Phase diagram of the mixed state of Bi2Sr2CaCu2O8 single crystals: first order phase transition at the irreversibility line

✍ Scribed by H. Pastoriza; M.F. Goffman; A. Arribére; F. de la Cruz

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
226 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

Magnetization and susceptibility measurements show a first order phase transition in the magnetic flux structure at the irreversibility line of Bi2Sr2Caeu208 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 Clansius-Clapeymn equation gives a variation of entropy of 0.06k B per vortex layer, at the transition. Above 360 Oe the H-T phase diagram is determined by the laminar nature of superconductivity and the irreversibility line is frequency dependent.

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