Temperature- and Magnetic-Field-Dependent Optical Properties of Heavy Quasiparticles in YbIr2Si2

Abstract

We report the temperature- and magnetic-field-dependent optical conductivity spectra of the heavy electron metal YbIr${}_2$Si${}_2$. Upon cooling below the Kondo temperature ($T_{\mathrm{K}}$), we observed a typical charge dynamics that is expected for a formation of a coherent heavy quasiparticle state. We obtained a good fitting of the Drude weight of the heavy quasiparticles by applying a modified Drude formula with a photon energy dependence of the quasiparticle scattering rate that shows a similar power-law behavior as the temperature dependence of the electrical resistivity. By applying a magnetic field of 6T below $T_{\mathrm{K}}$, we found a weakening of the effective dynamical mass enhancement by about 12% in agreement with the expected decrease of the $4f$-conduction electron hybridization on magnetic field.

5 pages, 4 figures. to be published in Journal of the Physical Society of Japan Vol. 79 (2010) No. 12

References in corpus (5)

• Quantum Criticality in Heavy Fermion Metals
• Pseudogap Formation and Heavy Carrier Dynamics in Intermediate Valence YbAl3
• Observation of an optical non-Fermi-liquid behavior in the heavy fermion state of YbRh${}_2$Si${}_2$
• Origin of infrared peaks in the optical conductivity of ytterbium compounds
• Heavy fermion fluid in high magnetic fields: an infrared study of CeRu${}_4$Sb${}_{12}$

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• Optical Evidence of Itinerant-Localized Crossover of $4f$ Electrons in Cerium Compounds
• Relation between $c$-$f$ hybridization and magnetic ordering in CeRu${}_2$Al${}_{10}$: An optical conductivity study of Ce(Ru${}_{1-x}$Rh${}_x$)${}_2$Al${}_{10}$ ($x\le 0.05$)
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