Correlation between transport properties and valence instability states of Eu ions in LuxEu1−xCu2Si2

• Published in: Journal of alloys and compounds Vol. 367; no. 1-2; pp. 219 - 223
• Main Authors: Kuzhel, B.S., Belan, B.D., Stets’, I.N.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 24-03-2004; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic conduction in metals and alloys; Electronic transport; Electronic transport in condensed matter; Electron–electron interactions; Exact sciences and technology; Intermetallics; Kondo effects; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Physics; Scattering mechanisms and kondo effect; Valence fluctuation, kondo lattice, and heavy-fermion phenomena; Valence fluctuations; Intermetallics; Valence fluctuations; Electron–electron interactions; Electronic transport; Kondo effects; Electrical conductivity; Intermetallic compounds; Silicides; Strong interactions; Coexistence; Lattice parameters; Electron-electron interactions; Magnetic susceptibility; Kondo effect; Solid solutions; X-ray absorption spectra; Temperature effects; Thermoelectric power; Instability; Chemical composition; Transport processes; Mixed valence
• DOI: 10.1016/j.jallcom.2003.08.041
• EISSN: 1873-4669
• ISSN: 0925-8388

Results of measurements of thermopower, electrical resistance, dc magnetic susceptibility, X-ray absorption and diffraction are presented for alloys of the solid solution LuxEu1−xCu2Si2. The temperature dependencies of the thermopower and electrical resistance are similar to those observed for other systems, based on Ce, Eu, and Yb with strong electron–electron interactions. As in the LaxEu1−xCu2Si2 system, the coexistence of Kondo behavior and valence instability states of Eu ions is observed. The Kondo-type state appears on increasing the value of the crystalline lattice parameter a. In the LuxEu1−xCu2Si2 system, the a parameter reaches its maximum values in the composition range 0.2≤x≤0.3 (a=0.4096 and 0.4098nm for x=0.2 and 0.3, respectively).