Magnetic and electronic properties of the LaNi5-xCux system
Autor(en): | Burzo, E Chiuzbaian, SG Chioncel, L Neumann, M |
Stichwörter: | BEHAVIOR; Physics; Physics, Condensed Matter | Erscheinungsdatum: | 2000 | Herausgeber: | IOP PUBLISHING LTD | Journal: | JOURNAL OF PHYSICS-CONDENSED MATTER | Volumen: | 12 | Ausgabe: | 27 | Startseite: | 5897 | Seitenende: | 5904 | Zusammenfassung: | The magnetic properties of the LaNi5-xCux system (x less than or equal to 1.5) were investigated in the temperature range 1.7-300 K. The magnetic susceptibilities chi increase up to a characteristic temperature T-max and then decrease. At T less than or equal to 10 K the chi-values of LaNi5 follow a T-2-dependence. At temperatures above a characteristic temperature T* a Curie-Weiss-type behaviour was observed for all samples investigated. The effective nickel moments decrease when increasing the Cn content. X-ray photoelectron spectroscopy measurements and a band-structure calculation show that the Fermi level is shifted towards a region with lower density of states when Cu is substituted for Ni. There is a weak hybridization between Ni and Cu d states. The magnetic properties were analysed in the spin-fluctuation model. The smaller values of the effective moments of nickel as compared to the free Ni2+ ion indicate that LaNi5-xCux is a non-saturated spin-fluctuation system. |
ISSN: | 09538984 | DOI: | 10.1088/0953-8984/12/27/308 |
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geprüft am 19.05.2024