Magnetic and Electrical Properties of Eu-Yb Alloy at High Pressure

By regulating the pressure, the number of conduction electrons in EuxYb1-x alloy was varied to study the relation between number of conduction electrons and the Eu spin configuration through measurements of the magnetic transformation points Tc (ferro-para), Tt (spin glass-ferro) and Tg (spin glass-para), the magnetization and the electrical resistivity. At x = 0.025, increasing pressure leads to a transition to a semiconducting state, i.e. a decreasing number of conduction electrons. The transition points Tc and Tt changed considerably with pressure, the change in Tc being especially great for systems containing only rare earth elements, while Tg, where it existed, showed almost no pressure dependence.