Signatures of phase transitions in the microwave response of YbRh2Si2

Abstract

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.

arXiv comment5 pages, 3 figures

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Cited by in corpus (4)

• Metallic coplanar resonators optimized for low-temperature measurements
• Microwave study of superconducting Sn films above and below percolation
• Angle-dependent electron spin resonance of YbRh${}_2$Si${}_2$ measured with planar microwave resonators and in-situ rotation
• Characterization of harmonic modes and parasitic resonances in multi-mode superconducting coplanar resonators