Magnetic and structural properties of the magnetic shape memory compound Ni2Mn1.48Sb0.52

P. J. Brown, A. P. Gandy, K. Ishida, W. Ito, R. Kainuma, T. Kanomata, K. U. Neumann, K. Oikawa, B. Ouladdiaf, A. Sheikh, K. R.A. Ziebeck

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Abstract

Magnetization and high resolution neutron powder diffraction measurements on the magnetic shape memory compound Ni2Mn1.48Sb 0.52 have confirmed that it is ferromagnetic below 350K and undergoes a structural phase transition at TM≈310K. The high temperature phase has the cubic L21 structure with a = 5.958, with the excess manganese atoms occupying the 4(b) Sb sites. In the cubic phase above ≈310K the manganese moments are ferromagnetically aligned. The magnetic moment at the 4(a) site is 1.57(12) μB and it is almost zero (0.15(9)μB) at the 4(b) site. The low temperature orthorhombic phase which is only fully established below 50K has the space group Pmma with a cell related to the cubic one by a Bain transformation aorth = (acub + bcub)/2; borth = ccub and corth = (acub - bcub). The change in cell volume is ≈2.5%. The spontaneous magnetization of samples cooled in fields less than 0.5T decreases at temperatures below TM and at 2K the magnetic moment per formula unit in fields up to 5.5T is 2.01(5) μB. Neutron diffraction patterns obtained below ≈132K gave evidence for a weak incommensurate magnetic modulation with propagation vector (2/3, 1/3, 0).

Original languageEnglish
Article number096002
JournalJournal of Physics Condensed Matter
Volume22
Issue number9
DOIs
Publication statusPublished - 2010 Feb 26

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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