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dc.contributor.author양인상-
dc.date.accessioned2016-08-28T11:08:07Z-
dc.date.available2016-08-28T11:08:07Z-
dc.date.issued2006-
dc.identifier.issn0374-4884-
dc.identifier.otherOAK-3437-
dc.identifier.urihttps://dspace.ewha.ac.kr/handle/2015.oak/219728-
dc.description.abstractWe report significant differences in the Raman spectra of two different kinds of CaB 6 single crystals grown from boron with a purity of 99.9 % (3N) or 99.9999 % (6N). Our Raman spectra of CaB 6 (3N) show peaks around 781 (T 2g), 1141 (E g), and 1283 cm -1 (A 1g), and they are very similar to previous Raman spectra of CaB 6. The E g mode shows a characteristic double-peak feature due to an additional weak broad peak centered around 1158 cm -1. However, the Raman spectra of CaB 6 (6N) show sharp peaks around 771 (T 2g), 1137 (E g), and 1266 cm -1 (A 1g). The peak frequencies are down shifted as much as ∼17 cm -1. In addition, no additional peak feature is observed for the E g mode so that the mode is symmetric in the case of CaB 6 (6N). The X-ray powder diffraction patterns for both CaB 6 (3N) and CaB 6 (6N) show that the lattice parameters are essentially the same. The majority of the impurity in the 99.9 %-pure (3N) boron is C. Thus, we doped CaB 6 (6N) with C, making Ca(B 0.995C 0.005) 6, and looked for differences in the Raman spectra. The Raman spectra of Ca(B 0.995C 0.005) 6 are nearly identical to those of CaB 6 (6N), indicating that the differences between the Raman spectra of CaB 6 (3N) and CaB 6 (6N) are not due to a C impurity. The Raman results show that the presence of impurities, not the amount of them, is enough to trigger local symmetry breaking in CaB 6. The broadening of T 2g, the additional E g2 mode and the asymmetry of A 1g in CaB 6 (3N) can be understood in terms of the symmetry of the arrangements of the boron octahedra lowered by local symmetry breaking.-
dc.languageEnglish-
dc.titleBoron-purity-dependent Raman spectra of CaB 6-
dc.typeArticle-
dc.relation.issue1-
dc.relation.volume49-
dc.relation.indexSCI-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.indexKCI-
dc.relation.startpageL1-
dc.relation.lastpageL5-
dc.relation.journaltitleJournal of the Korean Physical Society-
dc.identifier.wosidWOS:000239073100001-
dc.identifier.scopusid2-s2.0-33747058272-
dc.author.googleSong M.-
dc.author.googleYang I.-S.-
dc.author.googleKim J.Y.-
dc.author.googleCho B.K.-
dc.contributor.scopusid양인상(7101797839)-
dc.date.modifydate20211101105458-
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자연과학대학 > 물리학전공 > Journal papers
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