TRANSPORT MEASUREMENTS AT LOW-TEMPERATURES IN A DIAMOND-ANVIL CELL WITH HELIUM AS PRESSURE MEDIUM

We report the development of a technique to measure transport properti es using a new diamond anvil cell and helium as pressure transmitting medium to ensure hydrostatic conditions. The chamber pressure is measu red at any working temperature below 300 K by the ruby fluorescence me thod. This technique has been used to pressures up to 3 GPa at T=5 K t o measure the effect of hydrostatic pressure and magnetic field on the superconducting transition temperature of a single crystal of the ani sotropic cuprate superconductor Bi2.1Sr1.9-yLayCuO6+delta. (C) 1997 Am erican Institute of Physics.