Magnetic Phase Diagram of YbRh\textsubscript2Si\textsubscript2: the Influence of Hyperfine Interactions

2025/01/29 by Knapp, Jan, Levitin, Lev V., Nyeki, Jan +6
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2501.17560

Abstract

We report the determination of the magnetic phase diagram of the heavy fermion metal YbRh\textsubscript2Si\textsubscript2 in magnetic fields up to 70 mT applied perpendicular to the crystallographic c-axis. By a combination of heat capacity, magneto-caloric, and magneto-resistance measurements we map two antiferromagnetic phases: the electronic AFM1 below 70 mK and electro-nuclear AFM2 below 1.5 mK. The measurements extend into the microkelvin regime to explore the quantum phase transitions in this system. We demonstrate how the hyperfine interaction significantly modifies the phase diagram and the putative field-tuned quantum critical point. The determination of the rich magnetic properties of YbRh\textsubscript2Si\textsubscript2 is essential to understanding the interplay of the two magnetic orders and superconductivity in this compound.

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