Magnetic, structural, and transport properties of the Heusler alloys Co 2 MnSi and NiMnSb

Lance Ritchie, Gang Xiao, Y. Ji, Y. Chen, L. Chien, Ming Zhang, Jinglan Chen, Zhuhong Liu, Guangheng Wu, Xixiang Zhang

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177 Scopus citations

Abstract

We report on structural, magnetic, transport, and spin-polarization measurements of the Heusler alloys Co 2 MnSi and NiMnSb. Laue diffraction patterns confirm the single-crystal nature of Co 2 MnSi. Room-temperature transport measurements show a negative magnetoresistance in NiMnSb. Point-contact Andreev reflection measurements of the spin polarization yield polarization values for Co 2 MnSi and NiMnSb of 56% and 45%, respectively. Temperature dependence of resistivity for Co 2 MnSi reveals a relatively large residual resistivity ratio (ρ293 K/ρ5 K) typical of single-crystal Heusler alloys. In NiMnSb, resistivity and magnetization as a function of temperature show evidence of a magnetic phase transition near 90 K.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number10
DOIs
StatePublished - Jan 1 2003

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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