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• W2041610412 abstract "Inelastic neutron-scattering techniques have been used to study the low-energy phonon excitations in superconducting $R{mathrm{Ni}}_{2}{mathrm{B}}_{2}mathrm{C}$ ($R=mathrm{Lu},$ Y) to further characterize the anomalous features observed by Kawano et al. [Phys. Rev. Lett. 77, 4628 (1996)] for $R=mathrm{Y}$ and Stassis et al. [Phys. Rev. B 55, R8678 (1997)] for $R=mathrm{Lu},$ when these systems enter the superconducting ground state. We find that above ${T}_{c}$ the frequencies of the ${ensuremath{Delta}}_{4}[ensuremath{xi}00]$ lowest-lying acoustic and optic phonon modes decrease with decreasing temperature, for ensuremath{xi} close to the nesting vector ${mathbf{ensuremath{xi}}}_{m}.$ In addition there is a shift of intensity from the upper to the lower mode, an effect characteristic of mode coupling. The observed intensity transfer between these modes above ${T}_{c}$ can be described satisfactorily in both compounds by a coupled-mode model. Below ${T}_{c}$ the observed spectrum changes dramatically: it consists of a sharp peak at approximately 4 meV with a broad weak shoulder at higher energies. The experimental results unambiguously show that this dramatic change is due to the onset of superconductivity in these compounds. In this temperature region, the results are in qualitative agreement with recent theoretical calculations." @default.
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• W2041610412 date "1998-04-01" @default.
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• W2041610412 title "Low-energy phonon excitations in superconducting<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>R</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>B</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant=normal>C</mml:mi></mml:math>(<mml:math xmlns:mml=http…" @default.
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• W2041610412 doi "https://doi.org/10.1103/physrevb.57.7916" @default.
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