Interplay between valence fluctuations and lattice instabilities across the quantum phase transition in EuCu2(Ge1−xSix)2
Increasing Si concentrations in the EuCu2 (Ge1−xSix )2 series tunes the divalent Eu antiferromagnetic (AF) compound EuCu2Ge2 (TN = 14 K) to a nonmagnetic intermediate valence (IV) system EuCu2Si2. There is a collapse of the magnetic state and heavy quasiparticles occur at x ∼ 0.7…
كلمات مطابقة: lattice، instabilities