Interplay between valence fluctuations and lattice instabilities across the quantum phase transition in EuCu2(Ge1−xSix)2

أ.د. محمود عبدالرازق الذرعاني; Prof. Dr. Mahmoud Abdelrazek Ahmida

المؤهلات العلمية

دكتوراة في الفيزياء

المنشورات العلمية

بحث منشور 2020

Interplay between valence fluctuations and lattice instabilities across the quantum phase transition in EuCu2(Ge1−xSix)2

Physical Review B American Physical Society DOI

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 corresponding to a quantum critical point (QCP). We have systematically investi…

بحث منشور 2020

Charge fluctuations across the pressure-induced quantum phase transition in EuCu2(Ge1−xSix)2

Physical Review B American Physical Society DOI

Pressurizing strategically selected compositions of the EuCu2(Ge1−xSix )2 series affords an opportunity for gaining microscopic insight into the ground-state properties and interplay between magnetism and valence fluctuations across a quantum critical point. This is investigated by way of systematic 151Eu Mössbauer spectroscopy measurements on x = 0 and x = …

بحث منشور 2009

Structural Phase Transitions in EuC2

Inorganic chemistry American Chemical Society DOI

Pure EuC2, free of EuO impurities, was obtained by the reaction of elemental europium with graphite at 1673 K. By means of synchrotron powder diffraction experiments, the structural behavior was investigated in the temperature range from 10 to 1073 K. In contrast to former results, EuC2 crystallizes in the ThC2 type structure (C2/c, Z =4) at room temperature…