Finite size effect on the magnetic excitations spectra, phonons and heat conduction of the quasi- one-dimensional spin chains system SrCuO 2 - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physica B: Condensed Matter Année : 2018

Finite size effect on the magnetic excitations spectra, phonons and heat conduction of the quasi- one-dimensional spin chains system SrCuO 2

Résumé

We report inelastic neutron scattering measurements of the phonons modes, in the one-dimensional half integer spin chains cuprate SrCuO2. We study the longitudinal and the transverse modes propagating in the direction of the chains, along Q (0 0 L) and Q (2 0 L), respectively. On the other hand, we investigate the effect of substitution by impurities in the corresponding doped compounds, namely, SrCu0.99M0.01O2 with M=Mg or Zn, and La0.01Sr0.99CuO2. Our results evidence a systematic strong spinon-phonon interaction leading to an important decrease of the phonon scattered intensity as well as a decrease of the group velocity of the transverse acoustic modes upon substitution, and a shift of the transverse optical B3 u mode in the La-doped SrCuO2, in terms of energy.
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Dates et versions

hal-01938324 , version 1 (28-11-2018)

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Dalila Bounoua, Romuald Saint-Martin, Sylvain Petit, Frederic Bourdarot, Loreynne Pinsard-Gaudart. Finite size effect on the magnetic excitations spectra, phonons and heat conduction of the quasi- one-dimensional spin chains system SrCuO 2. Physica B: Condensed Matter, 2018, 536, pp.323 - 326. ⟨10.1016/j.physb.2017.10.104⟩. ⟨hal-01938324⟩
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