Observation of a new excitation in the mixed-valent state of YbInCu_4

Infrared measurements are used to obtain conductivity as a function of temperature and frequency in YbInCu_4, which exhibits an isostructural transition to a mixed-valent state at T_v \simeq 42 K. In addition to a gradual loss of spectral weight with decreasing temperature extending up to 1.5 eV, sh...

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Veröffentlicht in:arXiv.org 1999-10
Hauptverfasser: Garner, S R, Rodriguez, Y W, Schlesinger, Z, Bucher, B, Fisk, Z, Sarrao, J L
Format: Artikel
Sprache:eng
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Zusammenfassung:Infrared measurements are used to obtain conductivity as a function of temperature and frequency in YbInCu_4, which exhibits an isostructural transition to a mixed-valent state at T_v \simeq 42 K. In addition to a gradual loss of spectral weight with decreasing temperature extending up to 1.5 eV, sharp resonances appear in the mixed-valent state at 0 and 0.25 eV . These features may be key to understanding both YbInCu_4 and the nature of the mixed-valent Kondo state.
ISSN:2331-8422