Abstract
Electronic structure and magnetic properties of light actinide intermetallic compounds are often related to interplay between localized and itinerant (band like) behavior of 5f electrons. The properties of some actinide, mainly Np, intermetallic compounds were studied by Moessbauer effect, ac and dc susceptibility, X-ray and neutron diffraction. NpX{sub 2} (X=Ga,Si): both compounds order ferromagnetically at TC=55(2) and 48(2) K respectively. Comparison of our data with results for other NpX{sub 2} (X=Al,As,Sb,Tl) indicates that NpGa{sub 2} is a highly localized 5f electron system, whereas in NpSi{sub 2} the 5f electrons are partially delocalized. Magnetic properties of NpX{sub 2} compounds can neither be consistently explained within conventional crystal electric field picture (CEF) nor by taking into account hybridization dressing of local spin density models. NpX{sub 3} (X=Ga,Si,In,Al) in the AuCu{sub 3} (Pm3m) structure: from Mossbauer isomer shift data, the Np ion in the NpX{sub 3} family is close to the formal 3+ (5I{sub 4}) charge state. Magnetic moment of Np in NpSi{sub 3} is totally suppressed whereas in NpGa{sub 3} and NpAl{sub 3} a localized (narrow band) moment is established. However, in NpIn{sub 3} at 4.2 K, a modulated magnetic moment (0-1.5{mu}B) is observed. Comparing the magnetic behavior of the NpX{sub 3}
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Yaar, Ilan
[1]
- Israel Atomic Energy Commission, Beersheba (Israel). Nuclear Research Center-Negev
Citation Formats
Yaar, Ilan.
Magnetic and electronic properties of some actinide intermetallic compounds.
Israel: N. p.,
1992.
Web.
Yaar, Ilan.
Magnetic and electronic properties of some actinide intermetallic compounds.
Israel.
Yaar, Ilan.
1992.
"Magnetic and electronic properties of some actinide intermetallic compounds."
Israel.
@misc{etde_10134915,
title = {Magnetic and electronic properties of some actinide intermetallic compounds}
author = {Yaar, Ilan}
abstractNote = {Electronic structure and magnetic properties of light actinide intermetallic compounds are often related to interplay between localized and itinerant (band like) behavior of 5f electrons. The properties of some actinide, mainly Np, intermetallic compounds were studied by Moessbauer effect, ac and dc susceptibility, X-ray and neutron diffraction. NpX{sub 2} (X=Ga,Si): both compounds order ferromagnetically at TC=55(2) and 48(2) K respectively. Comparison of our data with results for other NpX{sub 2} (X=Al,As,Sb,Tl) indicates that NpGa{sub 2} is a highly localized 5f electron system, whereas in NpSi{sub 2} the 5f electrons are partially delocalized. Magnetic properties of NpX{sub 2} compounds can neither be consistently explained within conventional crystal electric field picture (CEF) nor by taking into account hybridization dressing of local spin density models. NpX{sub 3} (X=Ga,Si,In,Al) in the AuCu{sub 3} (Pm3m) structure: from Mossbauer isomer shift data, the Np ion in the NpX{sub 3} family is close to the formal 3+ (5I{sub 4}) charge state. Magnetic moment of Np in NpSi{sub 3} is totally suppressed whereas in NpGa{sub 3} and NpAl{sub 3} a localized (narrow band) moment is established. However, in NpIn{sub 3} at 4.2 K, a modulated magnetic moment (0-1.5{mu}B) is observed. Comparing the magnetic behavior of the NpX{sub 3} family (X=Si,Ge,Ga, Al,In and Sn), we find an impressive variation of the magnetic properties, from temperature independent paramagnetism (TIP), localized and modulated ordered moments, to formation of a concentrated Kondo lattice. Hybridization of 5f electrons with ligand electrons appears to play a crucial role in establishing these magnetic properties, although at present a consistent theoretical picture can not be drawn. XFe{sub 4}Al{sub 8} (X=Ho,Np,U) spin galss (SG) systems in ThMn{sub 12} (I{sub 4}/mmm) structure: Localized and itinerant behaviour of the f (Abstract Truncated)}
place = {Israel}
year = {1992}
month = {Jun}
}
title = {Magnetic and electronic properties of some actinide intermetallic compounds}
author = {Yaar, Ilan}
abstractNote = {Electronic structure and magnetic properties of light actinide intermetallic compounds are often related to interplay between localized and itinerant (band like) behavior of 5f electrons. The properties of some actinide, mainly Np, intermetallic compounds were studied by Moessbauer effect, ac and dc susceptibility, X-ray and neutron diffraction. NpX{sub 2} (X=Ga,Si): both compounds order ferromagnetically at TC=55(2) and 48(2) K respectively. Comparison of our data with results for other NpX{sub 2} (X=Al,As,Sb,Tl) indicates that NpGa{sub 2} is a highly localized 5f electron system, whereas in NpSi{sub 2} the 5f electrons are partially delocalized. Magnetic properties of NpX{sub 2} compounds can neither be consistently explained within conventional crystal electric field picture (CEF) nor by taking into account hybridization dressing of local spin density models. NpX{sub 3} (X=Ga,Si,In,Al) in the AuCu{sub 3} (Pm3m) structure: from Mossbauer isomer shift data, the Np ion in the NpX{sub 3} family is close to the formal 3+ (5I{sub 4}) charge state. Magnetic moment of Np in NpSi{sub 3} is totally suppressed whereas in NpGa{sub 3} and NpAl{sub 3} a localized (narrow band) moment is established. However, in NpIn{sub 3} at 4.2 K, a modulated magnetic moment (0-1.5{mu}B) is observed. Comparing the magnetic behavior of the NpX{sub 3} family (X=Si,Ge,Ga, Al,In and Sn), we find an impressive variation of the magnetic properties, from temperature independent paramagnetism (TIP), localized and modulated ordered moments, to formation of a concentrated Kondo lattice. Hybridization of 5f electrons with ligand electrons appears to play a crucial role in establishing these magnetic properties, although at present a consistent theoretical picture can not be drawn. XFe{sub 4}Al{sub 8} (X=Ho,Np,U) spin galss (SG) systems in ThMn{sub 12} (I{sub 4}/mmm) structure: Localized and itinerant behaviour of the f (Abstract Truncated)}
place = {Israel}
year = {1992}
month = {Jun}
}