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Phys. Rev. B 64, 052409 (2001) [4 pages]

Evidence for temperature dependent moments ordering in ferromagnetic NiMnSb(100)

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C. N. Borca, Takashi Komesu, Hae-Kyung Jeong, and P. A. Dowben
Department of Physics and Astronomy and the Center for Materials Research and Analysis, Behlen Laboratory of Physics, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0111

Delia Ristoiu, Ch. Hordequin, J. P. Nozières, and J. Pierre
CNRS Laboratoire Louis Néel, 25 avenue des Martyrs, BP 166, 38042 Grenoble CEDEX 09, France

Shane Stadler and Y. U. Idzerda
Naval Research Laboratory, Material Physics Branch, Washington, DC 20375

Received 25 April 2001; published 16 July 2001

From magnetic circular dichroism measurements of the Heusler alloy NiMnSb, in combination with other techniques, we show that a dramatic increase in the Mn and Ni moments occurs below a “crossover” transition temperature of about 80–100 K. This phase transition is well below the Curie temperature of NiMnSb (∼730 K). While the spin polarization near the Fermi level, from spin-polarized inverse photoemission, remains very high for k∥=0, it is unlikely that NiMnSb is a half-metallic ferromagnet near room temperature.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.052409
DOI:
10.1103/PhysRevB.64.052409
PACS:
75.25.+z, 71.20.Lp, 73.20.At
 
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