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Pristine Quantum Criticality in a Kondo Semimetal



Wesley T. Fuhrman, Andrey Sidorenko, Jonathan Hanel, Hannes Winkler, Andrey Prokofiev, Jose Rodriguez Rivera, Yiming Qiu, Peter Blaha, Qimiao Si, Collin L. Broholm, Silke Paschen


The observation of quantum criticality in diverse classes of strongly correlated electron systems has been instrumental in establishing ordering principles, discovering new phases, and identifying the relevant degrees of freedom and interactions. At focus so far have been insulators and metals. Semimetals, which are of great current interest as candidate phases with nontrivial topology, are much less explored in experiments. Here we study the Kondo semimetal CeRu4Sn6 by magnetic susceptibility, specific heat, and inelastic neutron scattering experiments. The power-law divergence of the magnetic Grunesien ratio reveals that, surprisingly, this compound is quantum critical without tuning. The dynamical energy over temperature scaling in the neutron response, seen throughout the Brillouin zone, as well as the temperature dependence of the static uniform susceptibility indicate that temperature is the only energy scale in the criticality. Such behavior, which has been associated with Kondo destruction quantum criticality in metallic systems, may well be generic in the semimetal setting.
Science Advances


quantum criticality, Kondo semimetal, neutron scattering


Fuhrman, W. , Sidorenko, A. , Hanel, J. , Winkler, H. , Prokofiev, A. , Rodriguez, J. , Qiu, Y. , Blaha, P. , Si, Q. , Broholm, C. and Paschen, S. (2021), Pristine Quantum Criticality in a Kondo Semimetal, Science Advances (Accessed May 26, 2024)


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Created May 18, 2021, Updated September 20, 2021