Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds

Magnetic measurements and XPS studies were performed on LaNi5-xAlx, TbNi5-xAlx, DyNi5-xAlx, LaNi5-xCux and NdNi5-xCux systems. In addition, band structure calculations were also performed. The nickel moments in RNi5 (R=Nd, Tb, Dy) compounds are of ≅ 0.17 µB and ≅ 0.25 µB at 2c and 3g sites, resp...

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Autor principal:	Burzo, Emil
Formato:	article
Lenguaje:	EN
Publicado:	D.Ghitu Institute of Electronic Engineering and Nanotechnologies 2006
Materias:	Physics QC1-999 Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/6ab8d4b49e074356bdf9e6870980f69e
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spelling	oai:doaj.org-article:6ab8d4b49e074356bdf9e6870980f69e2021-11-21T12:10:16ZMagnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds 2537-63651810-648Xhttps://doaj.org/article/6ab8d4b49e074356bdf9e6870980f69e2006-01-01T00:00:00Zhttps://mjps.nanotech.md/archive/2006/article/3418https://doaj.org/toc/1810-648Xhttps://doaj.org/toc/2537-6365Magnetic measurements and XPS studies were performed on LaNi5-xAlx, TbNi5-xAlx, DyNi5-xAlx, LaNi5-xCux and NdNi5-xCux systems. In addition, band structure calculations were also performed. The nickel moments in RNi5 (R=Nd, Tb, Dy) compounds are of ≅ 0.17 µB and ≅ 0.25 µB at 2c and 3g sites, respectively. The nickel moments, in low temperature range, decrease when increasing Al or Cu content and are practically nil for x > 1. The 4f-5d-3d exchange interactions were analyzed and the contributions of local 4f-5d and short range 5d-3d exchange interactions to 5d band polarization are estimated. An effective field of the order of (30-40) T is necessary to induce a nickel moment, at 1.7 K. Above the Curie temperatures, the effective nickel moments were determined. The LaNi5-xCux and LaNi5-xAlx systems, show, at T ≤ 10 K, a T2 dependence of the magnetic susceptibilities, while above a characteristic temperature T* , a Curie-Weiss contribution was evidenced. The magnetic behaviour of nickel is analyzed in models, which take into account electron correlation effects in d bands. Burzo, EmilD.Ghitu Institute of Electronic Engineering and NanotechnologiesarticlePhysicsQC1-999ElectronicsTK7800-8360ENMoldavian Journal of the Physical Sciences, Vol 5, Iss 1, Pp 50-67 (2006)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronics TK7800-8360
spellingShingle	Physics QC1-999 Electronics TK7800-8360 Burzo, Emil Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds
description	Magnetic measurements and XPS studies were performed on LaNi5-xAlx, TbNi5-xAlx, DyNi5-xAlx, LaNi5-xCux and NdNi5-xCux systems. In addition, band structure calculations were also performed. The nickel moments in RNi5 (R=Nd, Tb, Dy) compounds are of ≅ 0.17 µB and ≅ 0.25 µB at 2c and 3g sites, respectively. The nickel moments, in low temperature range, decrease when increasing Al or Cu content and are practically nil for x > 1. The 4f-5d-3d exchange interactions were analyzed and the contributions of local 4f-5d and short range 5d-3d exchange interactions to 5d band polarization are estimated. An effective field of the order of (30-40) T is necessary to induce a nickel moment, at 1.7 K. Above the Curie temperatures, the effective nickel moments were determined. The LaNi5-xCux and LaNi5-xAlx systems, show, at T ≤ 10 K, a T2 dependence of the magnetic susceptibilities, while above a characteristic temperature T* , a Curie-Weiss contribution was evidenced. The magnetic behaviour of nickel is analyzed in models, which take into account electron correlation effects in d bands.
format	article
author	Burzo, Emil
author_facet	Burzo, Emil
author_sort	Burzo, Emil
title	Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds
title_short	Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds
title_full	Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds
title_fullStr	Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds
title_full_unstemmed	Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds
title_sort	magnetic and xps studies on rni5 (r=la, nd, tb, dy)-based compounds
publisher	D.Ghitu Institute of Electronic Engineering and Nanotechnologies
publishDate	2006
url	https://doaj.org/article/6ab8d4b49e074356bdf9e6870980f69e
work_keys_str_mv	AT burzoemil magneticandxpsstudiesonrni5rlandtbdybasedcompounds
_version_	1718419192115363840

Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds

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