2004
DOI: 10.1007/s00269-003-0369-4
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A temperature-dependent single-crystal Raman spectroscopic study of fayalite: evidence for phonon-magnetic excitation coupling

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Cited by 18 publications
(16 citation statements)
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“…Thus, garnet is better approximated by constant sound speeds than olivine. Data on FWHM of garnets are unknown, whereas ∂(ln FWHM)/∂T from Raman spectra of forsterite and olivine is ~0.14%/K (Kolesov and Geiger 2004a). The comparative large T derivative for the widths is compatible with the inverse temperature dependence of D (Eq.…”
Section: Functional Form For D(t) Of the Lattice Componentmentioning
confidence: 89%
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“…Thus, garnet is better approximated by constant sound speeds than olivine. Data on FWHM of garnets are unknown, whereas ∂(ln FWHM)/∂T from Raman spectra of forsterite and olivine is ~0.14%/K (Kolesov and Geiger 2004a). The comparative large T derivative for the widths is compatible with the inverse temperature dependence of D (Eq.…”
Section: Functional Form For D(t) Of the Lattice Componentmentioning
confidence: 89%
“…For forsterite and olivine, ∂(ln u)/∂T is -0.006 to -0.008 %/K (Anderson and Isaak 1995). Raman spectra show that forsterite and olivine peak widths increase strongly with T (Kolesov and Geiger 2004a), values of ∂(ln FWHM)/∂T are near 0.14 %/K for three Raman peaks examined in detail, and that FWHM is fi nite near 5 K for Raman bands of fayalite (Kolesov and Geiger 2004b), leading to: where a, A, etc., are constants. The linear coeffi cient B should dominate and has a positive sign.…”
Section: Background the Laser-fl Ash Techniquementioning
confidence: 95%
“…Further Mö ssbauer spectroscopic investigations conducted on single-crystals at low temperatures, focused on the nature of the electric field gradient around Fe 2+ in fayalite [17,18]. Above T N short-range magnetic order has experimentally been observed at least up to 80 K [19] or 130 K [11] and could potentially exist at temperatures as high as roughly 500 K based on Raman spectra recorded at different temperatures [20].…”
Section: Electronic Magnetic and Vibrational Propertiesmentioning
confidence: 99%
“…The magnetic properties of Fe-Mg olivines have also received much attention, as well as the static magnetic structure of fayalite and to a lesser extent the dynamic behaviour (see Kolesov and Geiger [13,20] for a short review and list of references). Experimentally, Robie et al [11] observed in low temperature heat-capacity measurements on fayalite a distinct k-transition at 64.88 K corresponding to a magnetic phase transition.…”
Section: Electronic Magnetic and Vibrational Propertiesmentioning
confidence: 99%
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