Interplay between localized and itinerant magnetism in Co-substituted FeGa 3

A. A. Gippius, V. Yu Verchenko, A. V. Tkachev, N. E. Gervits, C. S. Lue, A. A. Tsirlin, N. Büttgen, W. Krätschmer, M. Baenitz, M. Shatruk, A. V. Shevelkov

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29 Citations (Scopus)

Abstract

The evolution of the electronic structure and magnetic properties with Co substitution for Fe in the solid solution Fe1-xCoxGa3 was studied by means of ab initio band-structure calculations and nuclear spin-lattice relaxation 1/T1 of the 69,71Ga nuclei. The 69,71(1/T1) was studied as a function of temperature in a wide temperature range of 2-300 K for the concentrations x=0.0, 0.5, and 1.0. In the parent semiconducting compound FeGa3, the temperature dependence of the 69(1/T1) exhibits a huge maximum at about T∼6 K indicating the existence of in-gap states. The opposite binary compound, CoGa3, demonstrates a metallic Korringa behavior with 1/T1 T. In Fe0.5Co0.5Ga3, the relaxation is strongly enhanced due to spin fluctuations and follows 1/T1T1/2, which is a unique feature of weakly and nearly antiferromagnetic metals. This itinerant antiferromagnetic behavior contrasts with ab initio band-structure calculations, where a ferromagnetic state with an ordered moment of 0.5 μB/f.u. is predicted. The results are discussed in terms of the interplay between the localized and itinerant magnetism including in-gap states and spin fluctuations.

Original languageEnglish
Article number104426
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number10
DOIs
Publication statusPublished - 2014 Mar 31

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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