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Abstract
A new neptunium intermetallic compound, NpPt2In7, has been synthesized in polycrystalline form and characterized by several macroscopic techniques. A Rietveld analysis of its powder x-ray diffraction pattern shows that NpPt2In7 crystallizes in a tetragonal lattice with I4/mmm symmetry and lattice parameters a = 4.58471(3) Å, c = 21.5065(3) Å. Magnetic susceptibility, electrical resistivity, Hall effect, and heat capacity measurements indicate a metallic character and the occurrence of antiferromagnetic order below a Néel temperature TN =23 K. The transition is exceptionally robust and TN decreases by 0.2K under a magnetic field of 9 T. A modified Curie-Weiss fit of the high-temperature magnetic susceptibility curve χ(T) gives an effective magnetic moment close to the value expected for trivalent Np. Low temperature heat capacity measurements give a reduced Sommerfeld linear coefficient close to 25mJmol−1.K−2 and a Debye Temperature ΘD=181 K. First principles, correlated-band electronic structure calculations suggest that the neptunium magnetic moment in NpPt2In7 is localized and that a quasi-two-dimensional antiferromagnetic structure could result from the competition of very weak interlayer interactions leading to very anisotropic properties.
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Authors (9)
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Alexander Shick
- Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic
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S Khmelevskyi
- Center for Computational Materials Science, Vienna University of Technology, Wiedner Hauptstrasse 8-10, A-1040, Vienna, Austria
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J-C. Griveau
- European Commission, JRC, Directorate for Nuclear Safety and Security, Postfach 2340, 76125 Karlsruhe, Germany
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Eric Colineau
- European Commission, JRC, Directorate for Nuclear Safety and Security, Postfach 2340, 76125 Karlsruhe, Germany
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Rachel Eloirdi
- European Commission, JRC, Directorate for Nuclear Safety and Security, Postfach 2340, 76125 Karlsruhe, Germany
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Roberto Caciuffo
- European Commission, JRC, Directorate for Nuclear Safety and Security, Postfach 2340, 76125 Karlsruhe, Germany
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Keywords
Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
JOURNAL OF ALLOYS AND COMPOUNDS
no. 768,
pages 852 - 858,
ISSN: 0925-8388 - Language:
- English
- Publication year:
- 2018
- Bibliographic description:
- Klimczuk T., Shick A., Khmelevskyi S., Kozub A., Kolincio K., Griveau J., Colineau E., Eloirdi R., Caciuffo R.: Structural and physical characterization of NpPt2In7// JOURNAL OF ALLOYS AND COMPOUNDS. -Vol. 768, (2018), s.852-858
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.jallcom.2018.07.163
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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