Regensburg 2000 – wissenschaftliches Programm

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AM: Magnetismus

AM 13: Postersitzung: Dünne Schichten (1–22), Magnetowiderstand (23–40), Phasenübergänge (41–55), Mikromagnetismus (56–68), Spektroskopie (69–77), Nanokristalline Materialien (78–82), Anisotropie (83–86), Schmelzen (87–90), Weitere Bereiche (91–100)

AM 13.49: Poster

Dienstag, 28. März 2000, 16:00–20:00, A

NMR Studies on the Heusler Compound Co₂NbSn — •A. Wolter¹, A. Bosse¹, D. Mienert¹, S. Suellow¹, H.H. Klauß¹, F.J. Litterst¹, and C. Geibel² — ¹Institut für Metallphysik und Nukleare Festkörperphysik, Mendelssohnstrasse 3, D-38106 Braunschweig. — ²MPI CPfS, Bayreuther Str. 40/Haus 16, D-01187 Dresden.

The Heusler compound Co₂NbSn has earlier been reported to undergo a ferromagnetic transition below 120K and a structural transition from high-temperature-cubic to a tetragonally distorted low-temperature phase at 200 K. However, specific heat and susceptibility measurements on polycrystalline samples show that this system undergoes a first order structural and antiferromagnetic transition at 235 K. At 120-130 K a second order transition into a ferrimagnetic state has been observed.

We performed NMR experiments on this sample and will discuss the results in comparison with the proposed structural and magnetic phases.