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oai:recercat.cat:2445/98902025-12-04T20:45:06Zcom_2072_1057col_2072_478822col_2072_478917

Magnetic transition in highly frustrated SrCr8Ga4O19: The archetypal kagomé system Martínez Benjamin, Joan Josep Labarta, Amílcar Rodríguez Solá, Raúl Obradors, Xavier Materials magnètics Propietats magnètiques Magnetic materials Magnetic properties Both dc and ac magnetic susceptibility have been carefully measured and analyzed in order to determine the features of the low-temperature magnetic state of the highly frustrated SrCr 8 Ga 4 O 19 compound. The scaling analysis of the nonlinear part of the dc magnetic susceptibility gives clues that indicate that the nature of the magnetic state below T f does not correspond to a conventional spin glass. This idea is further confirmed by the study of the dynamic scaling that also differs from what is expected for a conventional spin glass. A progressive change towards a more conventional magnetic ordering below T f is observed by substituting Ga atoms by Fe atoms in the compound SrCr 8 Ga 4 − 2 x Fe x O 19 . For x=1.5, both the scaling analysis of the nonlinear part of the dc magnetic susceptibility and the dynamic scaling seem to indicate that a true spin-glass phase transition does exist at T f . This change in the magnetic behavior is attributed to the fact that the presence of a magnetic atom in the 4 f VI sites as a first neighbor of the Cr atoms, located in the 12k sites, will impose a ‘‘local preferential direction’’ for the magnetic moments removing somehow the strong intrinsic magnetic frustration of the kagomé lattice. 2009-10-30T09:48:02Z 2009-10-30T09:48:02Z 1994 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0163-1829 https://hdl.handle.net/2445/9890 1994 eng Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.50.15779 Physical Review B, 1994, vol. 50, núm. 21, p. 15779-15786. http://dx.doi.org/10.1103/PhysRevB.50.15779 (c) The American Physical Society, 1994 info:eu-repo/semantics/openAccess 8 p. application/pdf The American Physical Society Articles publicats en revistes (Física de la Matèria Condensada)