Open AccessStructural properties of Y 1– x Yb x Ni 2 B 2 C synthesized at high pressure: EXAFS data analysis
Author(s) -
Menushenkov A. P.,
Konarev P. V.,
Tsvyashchenko A. V.,
MeyerKlaucke W.,
Cortes R.
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500016733
Subject(s) - extended x ray absorption fine structure , crystallography , crystal structure , analytical chemistry (journal) , atmospheric temperature range , debye–waller factor , k edge , materials science , x ray crystallography , bond length , superconductivity , superconducting transition temperature , chemistry , diffraction , condensed matter physics , absorption spectroscopy , physics , thermodynamics , optics , chromatography
Local structure of Y 1– x Yb x Ni 2 B 2 C series synthesized at high pressure 8 GPa has been studied using EXAFS. Measurements were performed at the Ni K‐edge in temperature range 5‐300 K. The results show that the Debye‐Waller factor for Ni‐Ni bond in the parent YNi 2 B 2 C compound is characterized by the Einstein temperature Θ E = 350 K, while a minimum value of Θ E = 300 K is reached for the compound with x = 0.025, which has the highest critical temperature T c = 12.5 K of the superconductive transition. This correlates with the further suppressing of superconductivity and with the appearance of the local magnetic moments in the investigated Y 1– x Yb x Ni 2 B 2 C series for x ≥ 0.05 compounds. Observed changes in the local electronic and the local crystal structure of this system as a function of Yb concentration and of temperaturre were explained in the frame of the band filling effect.