Electron spin resonance of Gd in metallic Van-Vleck beryllides

Abstract

The exchange parameters between Gd and the host magnetic ions in the Van Vleck beryllides PrBe₁₃, EuBe₁₃, TmBe₁₃ and UBe₁₃ were extracted using the electron spin resonance technique. A significant variation of the (positive) exchange across the rare-earth series was observed and was interpreted in terms of the dependence of the rare-earth-conduction electron exchange parameter on the 4f occupation number.