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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| Format: | Article |
| Language: | English |
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D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2006-01-01
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| Series: | Moldavian Journal of the Physical Sciences |
| Online Access: | https://mjps.nanotech.md/archive/2006/article/3418 |
| _version_ | 1818901678415413248 |
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| author | Burzo, Emil |
| author_facet | Burzo, Emil |
| author_sort | Burzo, Emil |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-19T20:23:34Z |
| format | Article |
| id | doaj.art-6ab8d4b49e074356bdf9e6870980f69e |
| institution | Directory Open Access Journal |
| issn | 1810-648X 2537-6365 |
| language | English |
| last_indexed | 2024-12-19T20:23:34Z |
| publishDate | 2006-01-01 |
| publisher | D.Ghitu Institute of Electronic Engineering and Nanotechnologies |
| record_format | Article |
| series | Moldavian Journal of the Physical Sciences |
| spelling | doaj.art-6ab8d4b49e074356bdf9e6870980f69e2022-12-21T20:06:53ZengD.Ghitu Institute of Electronic Engineering and NanotechnologiesMoldavian Journal of the Physical Sciences1810-648X2537-63652006-01-015150673418Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compoundsBurzo, EmilMagnetic 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.https://mjps.nanotech.md/archive/2006/article/3418 |
| spellingShingle | Burzo, Emil Magnetic and XPS studies on RNi5 (R=La, Nd, Tb, Dy)-based compounds Moldavian Journal of the Physical Sciences |
| title | 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_short | 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 |
| url | https://mjps.nanotech.md/archive/2006/article/3418 |
| work_keys_str_mv | AT burzoemil magneticandxpsstudiesonrni5rlandtbdybasedcompounds |