Iron-Based Heavy Quasiparticles in SrFe${}_4$Sb${}_{12}$: An Infrared Spectroscopic Study

Abstract

Temperature-dependent infrared reflectivity spectra of SrFe${}_4$Sb${}_{12}$ has been measured. A renormalized Drude peak with a heavy effective mass and a pronounced pseudogap of 10 meV develops in the optical conductivity spectra at low temperatures. As the temperature decreases below 100 K, the effective mass ($m^{\ast }$) rapidly increases, and the scattering rate ($1/\tau$) is quenched. The temperature dependence of $m^{\ast }$ and $1/\tau$ indicates that the hybridization between the Fe 3d spins and the charge carriers plays an important role in determining the physical properties of SrFe${}_4$Sb${}_{12}$ at low temperatures. This result is the clear evidence of the iron-based heavy quasiparticles.

arXiv comment5 pages, 5 figures

References in corpus (7)

• Quantum criticality
• Heavy Carriers and Non-Drude Optical Conductivity in MnSi
• Extracting the electron--boson spectral function ${\alpha }^2$F($\omega$) from infrared and photoemission data using inverse theory
• Pseudogap Formation and Heavy Carrier Dynamics in Intermediate Valence YbAl3
• Heavy quasiparticles in the ferromagnetic superconductor ZrZn2
• High spin polarization in the ferromagnetic filled skutterudites KFe4Sb12 and NaFe4Sb12
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Cited by in corpus (6)

• Electrodynamics of Correlated Electron Materials
• Anisotropic Electronic Structure of the Kondo Semiconductor CeFe2Al10 Studied by Optical Conductivity
• Infrared study on the electronic structure of alkaline-earth-filled skutterudites AT4Sb12 (A = Sr, Ba; M = Fe, Ru, Os)
• Hard X-ray spectroscopy of the itinerant magnets $R$Fe${}_4$Sb${}_{12}$ ($R=$Na, K, Ca, Sr, Ba)
• Anisotropic Non-Fermi Liquid and Dynamical Planckian Scaling of a Quasi-Kagome Kondo Lattice System
• Low-Energy Electrodynamics of Heavy Quasiparticles in ZrZn2