Chapter 4 Intermetallic compounds of actinides

Sechovský, V.; Havela, L.

doi:10.1016/s1574-9304(05)80079-3

Cited by 85 publications

(60 citation statements)

References 487 publications

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Section: Introductionmentioning

confidence: 99%

“…Koelling et al 2 showed that the influence of 5 f -p hybridization can be studied systematically in isostructural UX 3 compounds, where X represents a group-III or group-IV element, as these compounds exhibit similar lattice parameters ͑i.e., the direct f -f overlap is almost the same͒. Similarly, the influence of 5 f -d hybridization can be studied in UT 3 compounds, where T is a transition-metal element. From these studies two basic findings have emerged: ͑a͒ the degree of localization increases with increasing U-X distance ͑increasing the volume by moving down in the group-III or group-IV column of the Periodic Table͒, i.e., decreasing f -p hybridization, and ͑b͒ filling up the d band ͑moving to the right in the transitionmetal row of the Periodic Table͒ yields an increasing degree of localization, i.e., decreasing f -d hybridization.…”

Section: Introductionmentioning

confidence: 99%

“…These trends, arising from 5 f -ligand hybridization, have been confirmed also in an extensive study of isostructural UTX compounds. 3,4 Recently, a number of isostructural U 2 T 2 X compounds ͑Tϭtransition metal, XϭSn, In͒ have been reported. 5,6 These compounds form in the tetragonal U 3 Si 2 structure type.…”

Section: Introductionmentioning

confidence: 99%

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Hybridization effects inU2T2Xcompounds: Magnetic structu

et al. 1996

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Hybridization effects in U2T2X compounds: Magnetic structures of U2Rh 2Sn and U2Ni 2In Nakotte, H.; Purwanto, A.; Robinson, R.A.; Prokes, K.; Klaasse, J.C.P.; de Chatel, P.F.; de Boer, F.R.; Havela, L.; Sechovsky, V.; Pereira, L.C.J.; Seret, A.; Rebizant, J.; Spirlet, J.C.; Trouw, F. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. The tetragonal intermetallic compounds U 2 Ni 2 In and U 2 Rh 2 Sn have been studied by means of specific-heat, electrical-resistivity, and neutron-diffraction techniques. At low temperatures, both compounds order antiferromagnetically in a magnetic unit cell doubled along the c axis, and we find 5 f moments of 0.60 and 0.38 B /U atom for U 2 Ni 2 In and U 2 Rh 2 Sn, respectively. For U 2 Ni 2 In, our refinement also indicates a possible Ni moment of 0.37 B perpendicular to the U moments. We discuss the development of the 5 f moments together with findings on other isostructural U 2 T 2 X ͑Tϭtransition metal, XϭIn, Sn͒ compounds, and confirm that the trends expected due to 5 f -ligand hybridization also hold for this family of uranium compounds. Our analysis indicates different arrangements of the 5 f moments in the two compounds ͑noncollinear arrangement within the basal plane for U 2 Ni 2 In and collinear arrangement along the c axis for U 2 Rh 2 Sn͒, although both compounds have nearest-neighbor U-U distances along the c axis. This would mean that the magnetocrystalline anisotropy in U 2 T 2 X compounds is not determined by nearest-neighbor U-U links alone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybridization effects inU2T2Xcompounds: Magnetic structu

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“…4 The differences between the x-ray or neutrondiffraction patterns for the two types of structures can be sometimes easily overlooked because the extra reflections, which appear for the ordered ternary version, are usually very weak. In both structures, the U atoms are coordinated in zigzag U chains within which each U atom has two nearest U neighbors at a distance of d U -U ϳ350 pm.…”

Section: Introductionmentioning

confidence: 99%

Magnetism in URhSi

Prokeš¹,

Brück²,

Buschow³

et al. 1996

Journal of Applied Physics

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de Boer, F.R.; Sechovsky, V.; Svoboda, P.; Hu, X.; Maletta, H.; Gortenmulder, T. Published in:Journal of Applied Physics DOI:10.1063/1.361347 Link to publication Citation for published version (APA):Prokes, K., Brück, E. H., Buschow, K. H. J., de Boer, F. R., Sechovsky, V., Svoboda, P., ... Gortenmulder, T. (1996). Magnetism in URhSi. Journal of Applied Physics, 79, 5221-5223. DOI: 10.1063/1.361347 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Our neutron-powder-diffraction experiment revealed that URhSi crystallizes in the orthorhombic TiNiSi ͑space group Pnma͒ structure and orders ferromagnetically at low temperatures with the U magnetic moments of 0.11 B aligned along the c axis. Anomalies in the temperature dependence of the magnetic susceptibility, specific heat and electrical resistivity indicate that URhSi orders below 9.5 K. The enhanced C p /T value ͑extrapolated to 0 K͒ of 186 mJ/mol K 2 can be partially reduced in magnetic fields, which indicates a considerable magnetic contribution even at very low temperatures. The ferromagnetic ground state is documented also by magnetization measurements at low temperatures. The high-field magnetization data obtained on oriented powder reveal a strong magnetocrystalline anisotropy. All the results obtained on polycrystalline samples classify URhSi as an itinerant 5 f ferromagnet with very reduced U magnetic moments.

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“…In the past years, high-field magnetization measurements have proven to be a powerful tool in studying the role of hybridization in the formation of localized uranium 5f moments and in the magnetic anisotropy. In a systematic investigation of isostructural UTX (T = transition metal and X = p-electron element) compounds, a clear trend from itinerant 5f-electron behaviour to localized 5f moments was established with decreasing 5f-ligand hybridization [15]. It was also found that, as a rule, the strong magnetocrystalline anisotropy orients the uranium moments perpendicular to the shortest inter-uranium distance [16].…”

Section: 2• Hybridization Effects In Uranium Compoundsmentioning

confidence: 99%

Research in semi-continuous high magnetic fields

Franse

Boer

Frings

et al. 1994

Physica B: Condensed Matter

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Research in semi-continuous high magnetic fieldsFranse, J.J.M.; de Boer, F.R.; Frings, P.H.; de Visser, A. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. AbstractAn overview is presented of the main recent developments in the areas of research in the 40 T High Field Facility at the University of Amsterdam. In addition, the recent progress concerning the available sample environments for experiments in the facility are discussed.

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Chapter 4 Intermetallic compounds of actinides

Cited by 85 publications

References 487 publications

Hybridization effects inU2T2Xcompounds: Magnetic structu

Hybridization effects inU2T2Xcompounds: Magnetic structu

Magnetism in URhSi

Research in semi-continuous high magnetic fields

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