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  Interplay between localized and itinerant magnetism in Co-substituted FeGa3

Gippius, A. A., Verchenko, V. Y., Tkachev, A. V., Gervits, N. E., Lue, C. S., Tsirlin, A. A., et al. (2014). Interplay between localized and itinerant magnetism in Co-substituted FeGa3. Physical Review B, 89(10): 104426, pp. 1-8. doi:10.1103/PhysRevB.89.104426.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-1651-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-1653-A
Genre: Journal Article

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 Creators:
Gippius, A. A.1, Author
Verchenko, V. Yu1, Author
Tkachev, A. V.1, Author
Gervits, N. E.1, Author
Lue, C. S.1, Author
Tsirlin, A. A.1, Author
Büttgen, N.1, Author
Krätschmer, W.1, Author
Baenitz, M.2, Author              
Shatruk, M.1, Author
Shevelkov, A. V.1, Author
Affiliations:
1external, ou_persistent22              
2Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              

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 Abstract: The evolution of the electronic structure and magnetic properties with Co substitution for Fe in the solid solution Fe-1 xCoxGa3 was studied by means of ab initio band-structure calculations and nuclear spin-lattice relaxation 1/T1 of the (69),Ga-71 nuclei. The (69,71)(1/T-1) 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 similar to 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/T1 proportional to T1/2, 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 mu(B)/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.

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 Dates: 2014-03-31
 Publication Status: Published in print
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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 89 (10) Sequence Number: 104426 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008