Dramatic change of photoexcited quasiparticle relaxation dynamics across Yb valence state transition in YbInCu${}_4$

Abstract

YbInCu${}_4$ undergoes a first order structural phase transition near $T_v$=40 K associated with an abrupt change of Yb valence state. We perform ultrafast pump-probe measurement on YbInCu${}_4$ and find that the expected heavy fermion properties arising from the \emph{c-f} hybridization exist only in a limited temperature range above $T_v$. Below $T_v$, the compound behaves like a normal metal though a prominent hybridization energy gap is still present in infrared measurement. We elaborate that those seemingly controversial phenomena could be well explained by assuming that the Fermi level suddenly shifts up and becomes far away from the flat \emph{f}-electron band as well as the indirect hybridization energy gap in the mixed valence state below $T_v$.

5 pages

References in corpus (8)

• Electrodynamics of Correlated Electron Materials
• Ultrafast quasiparticle relaxation dynamics in normal metals and heavy fermion materials
• Coupling Between An Optical Phonon and the Kondo Effect
• Hybridization and superconducting gaps in heavy-fermion superconductor PuCoGa5 probed via the dynamics of photoinduced quasiparticles
• Multiple temperature scales of the periodic Anderson model: the slave bosons approach
• Infrared properties of heavy-fermions: evolution from weak to strong hybridizations
• Infrared study of valence transition compound YbInCu4 using cleaved surfaces
• First-Order Structural Change Accompanied by Yb Valence Transition in YbInCu4

Cited by in corpus (3)

• Optical spectroscopy and ultrafast pump-probe study of structural phase transition in 1T'-TaTe2
• Study of photoinduced valence dynamics in EuNi${}_2$(Si${}_{0.21}$Ge${}_{0.79}$)${}_2$ through time-resolved X-ray absorption spectroscopy
• Kondo lattice excitation observed using resonant inelastic X-ray scattering at the Yb $M_5$ edge