PRESSURE EFFECT ON ELECTRONIC-STRUCTURE AND MAGNETIC-PROPERTIES OF RNI5

Magnetic susceptibility of RNi5 single crystals (R = Gd, Tb, Dy) was s tudied under uniform and uniaxial pressures at temperatures above T-c. The uniform pressure derivatives of the paramagnetic Curie temperatur e Theta and the crystalline electric field parameter B-2(0) appear to be small. On the other hand, Theta and B-2(0) parameters display a lar ge sensitivity to. the uniaxial pressure due to related changes of c/a ratio. Ab initio electronic structure calculation was performed for G dNi5 to evaluate the volume derivative of T-c.