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

C. N. Borca; Takashi Komesu; Hae-Kyung Jeong; P. A. Dowben; Delia Ristoiu; Ch. Hordequin; J. P. Nozières; J. Pierre; Shane Stadler; Y. U. Idzerda

doi:10.1103/PhysRevB.64.052409

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

C. N. Borca, Takashi Komesu, Hae-Kyung Jeong, P. A. Dowben, Delia Ristoiu, Ch. Hordequin, J. P. Nozières, J. Pierre, Shane Stadler, and Y. U. Idzerda

Phys. Rev. B 64, 052409 – Published 16 July 2001

Abstract

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.

Received 25 April 2001

DOI:https://doi.org/10.1103/PhysRevB.64.052409

Authors & Affiliations

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