Anisotropic spin-dynamics in the Kondo semiconductor CeRu2Al10

Julien Robert; Jean-Michel Mignot; Sylvain Petit; Paul Steffens; Takashi Nishioka; Riki Kobayashi; Masahiro Matsumura; Hiroshi Tanida; Daiki Tanaka; Masafumi Sera

doi:10.1103/PhysRevLett.109.267208

Anisotropic spin-dynamics in the Kondo semiconductor CeRu2Al10

Strongly Correlated Electrons 2013-01-03 v1

Authors: Julien Robert , Jean-Michel Mignot , Sylvain Petit , Paul Steffens , Takashi Nishioka , Riki Kobayashi , Masahiro Matsumura , Hiroshi Tanida , Daiki Tanaka , Masafumi Sera

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Abstract

Spin dynamics in the new Kondo insulator compound CeRu2Al10 has been studied using unpolarized and polarized neutron scattering on single crystals. In the unconventional ordered phase forming below T0 = 27.3 K, two excitation branches are observed with significant intensities, the lower one of which has a gap of 4.8 +/- 0.3 meV and a pronounced dispersion up to about 8.5 meV. Comparison with RPA magnon calculations assuming crystal-field and anisotropic exchange couplings captures major aspects of the data, but leaves unexplained discrepancies, pointing to a key role of direction-specific hybridization between 4f and conduction band states in this compound.

Keywords

spin excitations in condensed matter frustrated magnetism spintronics

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@article{arxiv.1209.4613,
  title  = {Anisotropic spin-dynamics in the Kondo semiconductor CeRu2Al10},
  author = {Julien Robert and Jean-Michel Mignot and Sylvain Petit and Paul Steffens and Takashi Nishioka and Riki Kobayashi and Masahiro Matsumura and Hiroshi Tanida and Daiki Tanaka and Masafumi Sera},
  journal= {arXiv preprint arXiv:1209.4613},
  year   = {2013}
}

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Anisotropic spin-dynamics in the Kondo semiconductor CeRu2Al10

Abstract

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