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Physical Review B
Volumn 49, Issue 23, 1994, Pages 16809-16812
Low-temperature thermal expansion of SmB6: Evidence for a single energy scale in the thermodynamics of Kondo insulators
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EID: 0001098992     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.49.16809     Document Type: Article
Times cited : (35)
References (27)
  • 18
    • 84927347364 scopus 로고    scopus 로고
    • H. E. King. S. J. La Placa, T. Penney, and Z. Fisk, in Valence Fluctuations in Solids (Ref. 6), p. 333.
  • 21
    • 84927347363 scopus 로고    scopus 로고
    • T. Nanba et al. Physica B 186 188, 443 (1993).
  • 23
    • 84927347361 scopus 로고    scopus 로고
    • The single ion Kondo temperature TK can be estimated from inelastic neutron scattering data (Refs. protect, Ref. 21, and protect, Ref. 23). In Ref. protect, Ref. 21, the sharp excitation seen at 12.5 meV in the ground state broadens, shifts, and loses peak intensity as temperature increases. Near 100 K a broad line, centered at 15 meV, and with a width of 15 meV (full width at half maximum) is observed; such a line shape is typical of a mixed valent compound with TK=180 K. [An analogous renormalization of line shape is observed in Cesub 3Bisub 4Ptsub 3 (Ref. protect, Ref. 24). At low temperatures a gap is evident, but by 100 K the line has broadened sufficiently that resembles lines observed in mixed valent metals with TK =300 K.] In Ref. protect, Ref. 23, the large widths of the J=0 → J=1 (40 meV) and J= case 5/2 → J= case 7/2 (20 meV) excitations seen at 40 and 115 meV also set upper limits on TK. The widths of these excitations are governed by [Truncated]

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