Journal Article

PreJuSER-8053

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Determination of the magnetic structure of manganese carbodiimide with diffraction experiments using polarized neutrons

Krott, M. ; Houben, A. ; Müller, P. ; Schweika, W.FZJ* ; Dronskowski, R.

2009
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/11005  doi:10.1103/PhysRevB.80.024117

Abstract: The magnetic structure of MnNCN, the nitrogen equivalent of MnO, and the first carbodiimide of a non-d(10) transition metal ever made, has been determined on the basis of spin-polarized neutron-diffraction data close to absolute zero temperature. The S=5/2 moments of the high-spin Mn2+ ions lie within the ab hexagonal sheets and exhibit an antiferromagnetic ordering between the sheets along the c axis. Below the Neacuteel point (28 K), a temperature-dependent ordering pattern exists due to magnetic frustration inside the sheets, characterized by a varying angle between the moments. A comparison with other magnetic structures reveals that the compact NCN2- group is capable of mediating significant spin density needed to ensure relatively strong magnetic communication in view of a large Mn2+-Mn2+ separation.

Keyword(s): J ; antiferromagnetic materials (auto) ; carbon compounds (auto) ; frustration (auto) ; magnetic moments (auto) ; magnetic structure (auto) ; manganese compounds (auto) ; Neel temperature (auto) ; neutron diffraction (auto) ; nitrogen compounds (auto) ; space groups (auto)

Note: It is a pleasure to thank J. Walter (SV7) and Y. Su (DNS) for having collected the neutron-diffraction data. This study was made possible through financial grants by Deutsche Forschungsgemeinschaft and Bundesminister fur Bildung und Forschung whose support is also gratefully acknowledged.

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Contributing Institute(s):

1. Streumethoden (IFF-4)
2. Neutronenstreuung (IFF-5)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)
4. JCNS (Jülich Centre for Neutron Science JCNS (JCNS) ; JCNS)
5. Jülich Aachen Research Alliance - High-Performance Computing (JARA-HPC)

Research Program(s):

1. Kondensierte Materie (P54)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. DNS: Diffuse scattering neutron time of flight spectrometer (NL6S)

Appears in the scientific report 2009

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