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Trigonal field acting at the Cr3+ 2 E states in ruby from magneto-optical measurements under high pressure

Abstract: Magneto-optical measurements on ruby under high-pressure conditions provided direct determination of the trigonal crystal field acting at the t2g orbitals of Cr3+ in Al2O3 CrO6 and its dependence with pressure. The correlation study between the measured trigonal splitting and the trigonal distortion at the Al3+-substituted site indicates that the trigonal splitting increases with pressure whereas the trigonal distortion slightly reduces. The result is interpreted in terms of an enhancement of the electron-lattice coupling due to trigonal distortion upon reduction in the Al-O bond distance, i.e., the Cr-O bond distance R. The observed variations can be explained on the basis of empirical R dependence of the trigonal crystal field as VtrR?n with n=6. It is shown that this exponent does not change when we consider the pressure variation of the local structure around Cr3+ obtained from ab initio calculations. By the way, we also demonstrate that a methanol-ethanol mixture is a good pressure transmitting medium at cryogenic temperatures

 Fuente: Physical review. B, 2010, 81, 075120

 Editorial: American Physical Society

 Año de publicación: 2010

 Nº de páginas: 6

 Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevB.81.075120

 ISSN: 1098-0121,1550-235X,2469-9950,2469-9969

 Proyecto español: MAT2008-06873-C02-01

 Url de la publicación: https://doi.org/10.1103/PhysRevB.81.075120