Pressure Effect on the Vortex Phase Diagram in Bi_2Sr_2CaCu_2O_<8+y>
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Effects of hydrostatic pressure on the vortex phase diagram are studied in a highly anisotropic high temperature superconductor Bi<SUB>2</SUB>Sr<SUB>2</SUB>CaCu<SUB>2</SUB>O<SUB>8+y</SUB>. The local magnetization measured by using a micro-Hall-probe shows clear vortex lattice melting steps at high temperatures and the peak effect at low temperatures up to 1 GPa. We found that the pressure shifts these phase boundaries towards higher fields systematically. These changes are qualitatively unde0rstood by considering the reduction of the anisotropy γ of the system with pressure. The temperature dependence of pressure coefficient, however, suggests that there exists substantial contribution of the disorder to the phase boundaries in this system.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 511-513, 1998
The Japan Society of High Pressure Science and Technology