Abstract
Effects of hydrostatic pressure on the vortex phase diagram are studied in a highly anisotropic high temperature superconductor Bi2Sr2CaCu2O8+y. 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.
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