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Signatures of phase transitions in the microwave response of YbRh2Si2

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Krellner,  Cornelius
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  Christoph
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  Frank
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Parkkinen, K., Dressel, M., Kliemt, K., Krellner, C., Geibel, C., Steglich, F., et al. (2015). Signatures of phase transitions in the microwave response of YbRh2Si2. Physics Procedia, 75, 340-347. doi:10.1016/j.phpro.2015.12.040.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-9168-6
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.