Inelastic neutron studies of the low energy phonon excitations in the RENi{sub 2}B{sub 2}C superconductors (RE = Lu, Y, Ho, Er)

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The authors studied the low-energy phonon excitations for wavevectors close to the Fermi surface nesting vector {rvec {xi}}{sub m} {approx_equal} 0.55{rvec a}. They find that above T{sub c} the frequencies of the {Delta}{sub 4} [{zeta}00] lowest-lying optical and acoustic phonon modes decrease with decreasing temperature, for {rvec {xi}} close to {rvec {xi}}{sub m}, and there is a shift of intensity from the upper to the lower mode, an effect characteristic of coupled modes. From approximately 120K down to temperatures in the vicinity of T{sub c}, only a single unresolved peak is observed. Below T{sub c} the phonon spectra of the ... continued below

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8 p.

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Bullock, M.; Stassis, C.; Zarestky, J.; Goldman, A.; Canfield, P.; Shirane, G. et al. December 31, 1997.

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  • Ames Laboratory
    Publisher Info: Ames Lab., IA (United States)
    Place of Publication: Iowa

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The authors studied the low-energy phonon excitations for wavevectors close to the Fermi surface nesting vector {rvec {xi}}{sub m} {approx_equal} 0.55{rvec a}. They find that above T{sub c} the frequencies of the {Delta}{sub 4} [{zeta}00] lowest-lying optical and acoustic phonon modes decrease with decreasing temperature, for {rvec {xi}} close to {rvec {xi}}{sub m}, and there is a shift of intensity from the upper to the lower mode, an effect characteristic of coupled modes. From approximately 120K down to temperatures in the vicinity of T{sub c}, only a single unresolved peak is observed. Below T{sub c} the phonon spectra of the Y and Lu compounds change dramatically: they consist of a sharp peak at approximately 4.5 meV with a weak shoulder at the higher energy side. No such sharp peak was observed below T{sub c} in the Ho and Er compounds.

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8 p.

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INIS; OSTI as DE99002501

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  • International conference on neutron scattering (ICNS), Toronto (Canada), 17-21 Aug 1997

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  • Other: DE99002501
  • Report No.: CONF-970814--15
  • Grant Number: W-7405-ENG-82
  • Office of Scientific & Technical Information Report Number: 348919
  • Archival Resource Key: ark:/67531/metadc681705

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  • December 31, 1997

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  • July 25, 2015, 2:20 a.m.

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  • Nov. 6, 2015, 8:46 p.m.

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Bullock, M.; Stassis, C.; Zarestky, J.; Goldman, A.; Canfield, P.; Shirane, G. et al. Inelastic neutron studies of the low energy phonon excitations in the RENi{sub 2}B{sub 2}C superconductors (RE = Lu, Y, Ho, Er), article, December 31, 1997; Iowa. (digital.library.unt.edu/ark:/67531/metadc681705/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.