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Lattice dynamics and spin-phonon coupling in CaMn2O4 : a raman study

dc.contributor.authorIvanov, V. G.pt_BR
dc.contributor.authorHadjiev, Viktor G.pt_BR
dc.contributor.authorLytvynchuk, Alexander P.pt_BR
dc.contributor.authorDimitrov, D. Z.pt_BR
dc.contributor.authorShivachev, Boris Lubomirovpt_BR
dc.contributor.authorAbrashev, Miroslav Vergilovpt_BR
dc.contributor.authorLorenz, Berndpt_BR
dc.contributor.authorIliev, Milko N.pt_BR
dc.date.accessioned2014-11-20T02:16:19Zpt_BR
dc.date.issued2014pt_BR
dc.identifier.issn1098-0121pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/107213pt_BR
dc.description.abstractWe present polarized Raman spectra of CaMn2O4 (marokite) measured in several exact scattering configurations from oriented single crystals. Most of the 11Ag + 12B1g + 10B2g + 9B3g Raman-allowed modes are identified and assigned to definite atomic motions by comparison to the predictions of ab initio lattice dynamical calculations. The Raman modes at 474 cm-ˡ (Ag), 478 cm-ˡ (B1g), and 614 cm-ˡ (B1g) exhibit anomalous softening at temperatures below TN ≈ 220 K due to a spin-phonon coupling which depends strongly on the phonon eigenvectors. There are no indications for a structural transition in the temperature range between 80 and 850 K. We argue quantitatively that the mechanism of the phonon softening below TN is similar to that in the undoped manganese perovskites.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 89, no. 18 (May 2014), 184307, 8 p.pt_BR
dc.rightsOpen Accessen
dc.subjectEspectros ramanpt_BR
dc.subjectAutovalores e autofunçõespt_BR
dc.subjectModos maciospt_BR
dc.subjectCompostos de cálciopt_BR
dc.titleLattice dynamics and spin-phonon coupling in CaMn2O4 : a raman studypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000941091pt_BR
dc.type.originEstrangeiropt_BR


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