Lattice dynamics of ASb(2)O(6) (A = Cu, Co) with trirutile structure
D. T. Maimone, A. B. Christian, J. J. Neumeier, E. Granado
ARTIGO
Inglês
Agradecimentos: Work at UNICAMP was conducted with financial support from FAPESP Grant No. 2012/04870-7, CAPES, and CNPq, Brazil. Work at Montana State University was conducted with financial support from the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award...
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Agradecimentos: Work at UNICAMP was conducted with financial support from FAPESP Grant No. 2012/04870-7, CAPES, and CNPq, Brazil. Work at Montana State University was conducted with financial support from the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award No. DE-SC0016156
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Abstract: Raman spectroscopy experiments on single crystals of CuSb2O6 and CoSb2O6 quasi-one-dimensional antiferromagnets with trirutile crystal structure were performed, with a focus on the first material. The observed Raman-active phonon modes and previously reported infrared-active modes were...
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Abstract: Raman spectroscopy experiments on single crystals of CuSb2O6 and CoSb2O6 quasi-one-dimensional antiferromagnets with trirutile crystal structure were performed, with a focus on the first material. The observed Raman-active phonon modes and previously reported infrared-active modes were identified with the aid of ab initio lattice dynamics calculations. The structural transition between monoclinic beta-CuSb2O6 and tetragonal alpha-CuSb2O6 phases at T-s = 400 K is manifested in our spectra by a "repulsion" of two accidentally quasidegenerate symmetric modes below T-s, caused by a phonon mixing effect that is only operative in the monoclinic beta-CuSb2O6 phase due to symmetry restrictions. Also, two specific phonons, associated with CuO6 octahedra rotation and with a Jahn-Teller elongation mode, soften and broaden appreciably as T -gt; T-s. A crossover from a displacive to an order-disorder transition at T-s is inferred
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FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2012/04870-7
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
Aberto
Lattice dynamics of ASb(2)O(6) (A = Cu, Co) with trirutile structure
D. T. Maimone, A. B. Christian, J. J. Neumeier, E. Granado
Lattice dynamics of ASb(2)O(6) (A = Cu, Co) with trirutile structure
D. T. Maimone, A. B. Christian, J. J. Neumeier, E. Granado
Fontes
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Physical review. B, Covering condensed matter and materials physics Vol. 97, n. 10 (Mar., 2018), n. art. 104304, p. 1-10 |