An inelastic neutron scattering study of the spin dynamics of Yb{sub 1-x}Lu{sub x}Al{sub 3}.

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We present the results of a systematic inelastic neutron scattering study of the spin dynamics of the mixed valent compound YbAl{sub 3} doped with nonmagnetic lutetium. The aim of the investigation is to clarify the origin of the unusual gap-like magnetic response observed in YbAl{sub 3}, which can be modeled by two inelastic peaks: a narrow peak at 34 meV with HWHM, r = 6.4 {+-} 0.8 meV and a broad peak at 44 meV with {Lambda} = 30 {+-} 1 meV. Lutetium substitution leads to a substantial increase in the linewidth ({Lambda} = 9 {+-} 1 meV at x ... continued below

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17 p.

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Osborn, R. September 11, 1998.

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Description

We present the results of a systematic inelastic neutron scattering study of the spin dynamics of the mixed valent compound YbAl{sub 3} doped with nonmagnetic lutetium. The aim of the investigation is to clarify the origin of the unusual gap-like magnetic response observed in YbAl{sub 3}, which can be modeled by two inelastic peaks: a narrow peak at 34 meV with HWHM, r = 6.4 {+-} 0.8 meV and a broad peak at 44 meV with {Lambda} = 30 {+-} 1 meV. Lutetium substitution leads to a substantial increase in the linewidth ({Lambda} = 9 {+-} 1 meV at x = 0.1) and a decrease in the intensity (down by 60% at x = 0.1) of the narrow component, with a negligible effect on the broad inelastic peak. This trend is confirmed with higher doping resulting in the complete suppression of the narrow peak at x {ge} 0.35. The results indicate that the narrow component arises from coherent excitation processes within the hybridized 4f-band, which are destroyed by disorder, while the broad component is not so sensitive to the loss of coherence.

Physical Description

17 p.

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INIS; OSTI as DE00010957

Medium: P; Size: 17 pages

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  • 43rd Annual Conference on Magnetism and Magnetic Materials, Miami, FL (US), 11/09/1998--11/12/1998

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  • Report No.: ANL/MSD/CP-97253
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10957
  • Archival Resource Key: ark:/67531/metadc626489

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  • September 11, 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 3:35 p.m.

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Osborn, R. An inelastic neutron scattering study of the spin dynamics of Yb{sub 1-x}Lu{sub x}Al{sub 3}., article, September 11, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc626489/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.