Quantum criticality in Yb(Rh0.97Co0.03)2Si2 probed by low-temperature resistivity
Sven Friedemann, Niels Oeschler, Cornelius Krellner, Christoph Geibel, and Frank Steglich
TL;DR
This study investigates quantum criticality in a cobalt-doped YbRh2Si2 compound using resistivity and magnetoresistance measurements, revealing that the Kondo-breakdown occurs within the antiferromagnetic phase, consistent with the global phase diagram.
Contribution
It demonstrates that partial Co substitution stabilizes magnetism without shifting the Kondo-breakdown point, providing insights into quantum critical behavior under chemical pressure.
Findings
Kondo-breakdown signature remains at the same position as in pure YbRh2Si2.
Kondo-breakdown occurs within the antiferromagnetic phase.
Results align with the global phase diagram under chemical pressure.
Abstract
Quantum criticality in Yb(Rh0.97Co0.03)2Si2 is investigated by means of resistivity and magnetoresistance. The partial substitution of Co leads to a stabilization of the magnetism as expected according to the application of chemical pressure for Yb systems. However, the signature of the Kondo-breakdown remains at the same position in the temperature-magnetic field phase diagram compared to stoichiometric YbRh2Si2. As a consequence, the Kondo-breakdown is situated within the antiferromagnetic phase. These results fit well within the global phase diagram under chemical pressure [1].
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