Archive: 2006 - Moldavian Journal of the Physical Sciences

05 Jan 2006

2006
V. 5
1
(p.50 - 67)

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

Authors:

Burzo, Emil

Summary:

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.

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Crossref

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decrease when increasing Al or Cu content and are practically nil for x > 1. The 4f-5d-3d 
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5d-3d exchange interactions to 5d band polarization are estimated. An effective field of the 
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temperatures, the effective nickel moments were determined. The LaNi5-xCux and LaNi5-xAlx 
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BibTeX

@article{ibn_3418,
author = {Burzo, E.},
title = {Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds },
journal = {Moldavian Journal of the Physical Sciences},
year = {2006},
volume = {5 (1)},
pages = {50-67},
month = {Jan},
abstract = {(EN) 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. 
 },
url = {https://ibn.idsi.md/vizualizare_articol/3418},
}

DataCite

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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*
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<dc:description xml:lang='en'>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. 
 </dc:description>
<dc:source>Moldavian Journal of the Physical Sciences 5 (1) 50-67</dc:source>
<dc:title>Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds </dc:title>
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