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dc.contributor.authorRojas Pupo, Daniel 
dc.contributor.authorFernández Barquín, Luis 
dc.contributor.authorEspeso Martínez, José Ignacio 
dc.contributor.authorRodríguez Fernández, Jesús 
dc.contributor.authorChaboy, J.
dc.contributor.otherUniversidad de Cantabriaes_ES
dc.date.accessioned2012-03-29T11:36:54Z
dc.date.available2012-03-29T11:36:54Z
dc.date.issued2008-09-16
dc.identifier.issn1098-0121
dc.identifier.issn1550-235X
dc.identifier.urihttp://hdl.handle.net/10902/520
dc.description.abstractMeasurements 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.es_ES
dc.format.extent8 p.es_ES
dc.language.isoenges_ES
dc.publisherAmerican Physical Societyes_ES
dc.rights© The American Physical Societyes_ES
dc.sourcePhysical Review. B, Condensed matter and materials physics, vol.78, 2008, article number 094412.es_ES
dc.titleReduction of the Yb valence in YbAl3 nanoparticleses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.relation.publisherVersionhttp://dx.doi.org/10.1103/PhysRevB.78.094412
dc.rights.accessRightsopenAccesses_ES
dc.identifier.DOI10.1103/PhysRevB.78.094412
dc.type.versionpublishedVersiones_ES


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