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  Spin excitons from hybridized heavy quasiparticles in YbB12 and CeB6

Akbari, A., & Thalmeier, P. (2013). Spin excitons from hybridized heavy quasiparticles in YbB12 and CeB6. Journal of the Korean Physical Society, 62(10), 1418-1422. doi:10.3938/jkps.62.1418.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1ECA-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1ECB-9
Genre: Journal Article

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 Creators:
Akbari, A.1, Author              
Thalmeier, P.2, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

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 Abstract: In f-electron compounds the small indirect hybridization gap which is on the scale of the Kondo temperature leads to an enhanced bare spin response around the zone boundary wave vector, Q' = (pi, pi, pi). Due to the interaction of hybridized quasiparticles a collective spin exciton resonance mode may appear within or at the gap threshold around Q'. It was found in the small hybridization gap semiconductor YbB12 as well as in the heavy fermion metal CeB6. There are similarities to the spin excitons observed within the excitation gap of unconventional superconductors. We use an Anderson lattice type model supplemented by the molecular fields of hidden and magnetic order in the case of CeB6 to calculate the RPA spin response in these compounds. It exhibits the salient feature in frequency and momentum dependence around Q' found by inelastic neutron scattering.

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Language(s): eng - English
 Dates: 2013-05-12
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 668933
ISI: 000320122700012
DOI: 10.3938/jkps.62.1418
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Title: Journal of the Korean Physical Society
Source Genre: Journal
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Pages: - Volume / Issue: 62 (10) Sequence Number: - Start / End Page: 1418 - 1422 Identifier: ISSN: 0374-4884