Low Temperature Physics: 35, 89 (2009); https://doi.org/10.1063/1.3064918 (5 pages)
Физика Низких Температур: Том 35, Выпуск 1 (Январь 2009), c. 116-121    ( к оглавлению , назад )

Statistical model structure of A1-xZxB2 Laves phase C15 system - the superconducting Ce1-xLaxRu2 alloy

B.V. Robouch and A. Marcelli

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Via Enrico Fermi 40, I-00044 Frascati, Italy
E-mail: robouch@lnf.infn.it

N.L. Saini

Dipartimento di Fisica, Universitá di Roma «La Sapienza» P. le Aldo Moro 2, 00185 Roma, Italy

A. Kisiel

Instytut Fizyki, Universytet Jagiellonski, Reymonta 4, 30-059 Krakow, Poland

Received July 8, 2008


Local structure of Ce1-xLaxRu2 system, measured by EXAFS has been re-examined and correlated to the statistical ad hoc model, recently applied to the sphalerite, wurtzite and other intermetallic ternary alloys. The deconvolution of the EXAFS data show that the Ce1-xLaxRu2 ternary system is essentially a mixture of: CeRu2 and LaRu2 binary alloys with a small proportion of the Ce0.5La0.5Ru2 ternary configuration, being maximum for the intermediate concentration. Moreover, the analysis reveals that while the LaRu2 configuration exhibits a Bernoulli random distribution, the presence of a Ce atom affects both the CeRu2 and Ce0.5La0.5Ru2 distributions, strongly favoring the configuration with the CeCe pair, while keeping rare that with a single Ce ion.

PACS: 61.05.cj X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES;
PACS: 74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.);
PACS: 74.70.Tx Heavy-fermion superconductors.

Ключевые слова: Laves phases, Ce1-xLaxRu2 system, local structure, statistical model.