Optical evidence for heavy charge carriers in FeGe

Abstract

The optical spectrum of the cubic helimagnetic metal FeGe has been investigated in the frequency range from 0.01 - 3.1 eV for different temperatures from 30 K to 296 K. The optical conductivity shows the evolution of a low energy (0.22 eV) interband transition and the development of a narrow free carrier response with a strong energy and temperature dependence. The frequency dependent effective mass and scattering rate derived from the optical data indicate the formation of dressed quasi-particles with a mass renormalization factor of 12. Similar to FeSi the spectral weight in FeGe is not recovered over a broad frequency range, an effect usually attributed to the influence of the on-site Coulomb interaction.

5 pages, 5 figures

References in corpus (7)

• Kramers-Kronig constrained variational analysis of optical spectra
• Large Anomalous Hall effect in a silicon-based magnetic semiconductor
• Metallic State in Cubic FeGe beyond its Quantum Phase Transition
• First-order transition between a small-gap semiconductor and a ferromagnetic metal in the isoelectronic alloys FeSi${}_{1-x}$Ge${}_x$
• First order transition from correlated electron semiconductor to ferromagnetic metal in single crystalline FeSi1-xGex
• Suppressed reflectivity due to spin-controlled localization in a magnetic semiconductor
• Electronic structure and magnetism for FeSi${}_{(1-x)}$Ge${}_x$ from supercell calculations

Cited by in corpus (7)

• Electrodynamics of Correlated Electron Materials
• Laser-Induced Skyrmion Writing and Erasing in an Ultrafast Cryo-Lorentz Transmission Electron Microscopy
• Critical Quadrupole Fluctuations and Collective Modes in Iron Pnictide Superconductors
• Thermoelectricity in correlated narrow-gap semiconductors
• Magnetic interactions and possible structural distortion in kagome FeGe from first-principles study and symmetry analysis
• The importance of thermal disorder and electronic occupation for the T-dependence of the optical conductivity in FeSi and MnSi
• Optical spectra of the heavy fermion uniaxial ferromagnet UGe${}_2$