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    Reduction of the Yb valence in YbAl3 nanoparticles

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    2008PRBDaniel.pdf (367.8Kb)
    Identificadores
    URI: http://hdl.handle.net/10902/520
    DOI: 10.1103/PhysRevB.78.094412
    ISSN: 1098-0121
    ISSN: 1550-235X
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    Author
    Rojas Pupo, DanielAutoridad Unican; Fernández Barquín, LuisAutoridad Unican; Espeso Martínez, José IgnacioAutoridad Unican; Rodríguez Fernández, JesúsAutoridad Unican; Chaboy, J.
    Date
    2008-09-16
    Derechos
    © The American Physical Society
    Publicado en
    Physical Review. B, Condensed matter and materials physics, vol.78, 2008, article number 094412.
    Publisher
    American Physical Society
    Enlace a la publicación
    http://dx.doi.org/10.1103/PhysRevB.78.094412
    Abstract:
    Measurements of specific heat, dc magnetic susceptibility, and Yb LII and LIII x-ray absorption near-edge structure XANES and extended x-ray absorption fine structure EXAFS on YbAl3 milled alloys are reported. X-ray diffraction patterns are consistent with a reduction in particle size down to 10 nm and an increase in the lattice strain up to 0.4% for 120 h of milling time. A decrease in the mean valence from 2.86 for the unmilled alloy to 2.70 for 120 h milled YbAl3 is obtained from the analysis of XANES spectra. From the analysis of spectra in the EXAFS region, an increase in the mean-square disorder of neighbor distance with milling time is detected in good agreement with the results of x-ray diffraction. Size effects strongly influence the magnetic and thermal properties. The value for the maximum of the magnetic susceptibility decreases around 30% for 120 h milled alloy and an excess specific heat, with a peak around 40 K in the milled samples, is derived. These changes in the physical properties along the milled YbAl3 alloys are associated with the reduction in particle size. Such a reduction leads to the existence of a large number of Yb2+ atoms at the surface with respect to the bulk affecting the overall electronic state.
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    UNIVERSIDAD DE CANTABRIA

    Repositorio realizado por la Biblioteca Universitaria utilizando DSpace software
    Contact Us | Send Feedback
    Metadatos sujetos a:licencia de Creative Commons Reconocimiento 3.0 España