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Raman studies of nearly half-metallic ferromagnetic CoS2

TitleRaman studies of nearly half-metallic ferromagnetic CoS2
Publication TypeJournal Article
Year of Publication2014
AuthorsLyapin, SG, Utyuzh, AN, Petrova, AE, Novikov, AP, Lograsso, TA, Stishov, SM
JournalJournal of Physics-Condensed Matter
Date Published10
Type of ArticleArticle
ISBN Number0953-8984
Accession NumberWOS:000343313400031
KeywordsCoS2, cro2, fes2, half metal, high-pressure, light-scattering, optical phonons, phase-transition, phonon interaction, pyrite structure, Raman scattering, Spectroscopy, temperature-dependence

We measured the Raman spectra of ferromagnetic, nearly half-metallic, CoS2 over a broad temperature range. All five Raman active modes A(g), E-g, T-g(1), T-g(2) and T-g(3) were observed. The magnetic ordering is indicated by a change of the temperature dependences of the frequency and the line width of A(g) and T-g(2) modes at the Curie point. The temperature dependence of the frequencies and line widths of the A(g), E-g, T-g(1), T-g(2) modes in the paramagnetic phase can be described in the framework of the Klemens approach. Hardening of the T-g(2), T-g(1) and Ag modes on cooling can be unambiguously seen in the ferromagnetic phase. The line widths of T-g(2) and A(g) modes behave in a natural way at low exciting laser powers (they decrease with decreasing temperature) in the ferromagnetic phase. At high exciting laser powers the corresponding line widths increase as temperature decreases below the Curie temperature. Then, as will be shown, the line width of the A(g) mode reaches a maximum at about 80 K. Tentative explanations of some of the observed effects are given, taking into account the nearly half-metallic nature of CoS2.

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