2015/01/01 by Katja Parkkinen, Martin Dressel, Kristin Kliemt +7
Materials Science · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Fermi liquid theory #Fermi surface #Iron-based superconductors research #Magnetic field #Microwave #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum critical point #Quantum mechanics #Quantum oscillations #Quantum phase transition #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1016/j.phpro.2015.12.040
published as Physics Procedia 75, 340 (2015) · 5 pages, 3 figures
openalex publication_date 2015/01/01 · arxiv created 2016/04/01 · arxiv updated 2016/04/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We used a spectroscopic microwave technique utilizing superconducting stripline resonators at frequencies between 3 GHz and 15 GHz to examine the charge dynamics of YbRh2Si2 at temperatures and magnetic fields close to the quantum critical point. The different electronic phases of this heavy-fermion compound, in particular the antiferromagnetic, Fermi-liquid, and non-Fermi-liquid regimes, were probed with temperature-dependent microwave measurements between 40 mK and 600 mK at a set of different magnetic fields up to 140 mT. Signatures of phase transitions were observed, which give information about the dynamic response of this peculiar material that exhibits field-tuned quantum criticality and pronounced deviations from Fermi-liquid theory.