Low-Energy Electrodynamics of Heavy Quasiparticles in ZrZn2

Abstract

The temperature dependence of the optical conductivity spectrum of an itinerant ferromagnetic material, ZrZn${}_2$, was obtained and the dynamical effective mass and the scattering rate were derived. A renormalized Drude peak with a heavy effective mass developed at low temperatures. The effective mass rapidly increased below $\hslash \omega$ = 10 meV and at 10 K it was observed to be 3 times heavier than that at 300 K. The scattering rate also rapidly decreased below 10 meV at 10 K. These results indicate the creation of heavy quasiparticles at low temperatures due to spin fluctuations.

5 pages, 5 figures

References in corpus (3)

• Quantum criticality
• Observation of an optical non-Fermi-liquid behavior in the heavy fermion state of YbRh${}_2$Si${}_2$
• Iron-Based Heavy Quasiparticles in SrFe${}_4$Sb${}_{12}$: An Infrared Spectroscopic Study

Cited by in corpus (2)

• Electrodynamics of Correlated Electron Materials
• Origin of Middle-Infrared Peaks in Cerium Compounds