Tensile and compressive strain tuning of a Kondo lattice

Abstract

We present electrical resistivity measurements on the prototypical heavy-fermion metal YbRh${}_2$Si${}_2$ (YRS) under $a$-axis tensile and compressive strain and focus on the evolution of the resistivity maximum near 136~K that arises from the interplay of the Kondo effect and the crystal electric field (CEF) splitting. While compressive strain reduces $T_{\max }$, similar as previously reported for hydrostatic pressure, $T_{\max }$ is enhanced up to 145~K for 0.13\% tensile strain. Model calculations for the strain effect on CEF splitting in YRS reveal a negligible shift of the levels. Instead, the enhancement of the resistivity maximum indicates a 20\% increase of the Kondo temperature. This opens the perspective to access the hidden zero-field QCP in pure YRS.

References in corpus (7)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Divergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point in YbRh${}_2$Si${}_2$
• Energy scales of Lu(1-x)Yb(x)Rh2Si2 by means of thermopower investigations
• Grüneisen parameter studies on heavy fermion quantum criticality
• Uniaxial stress effect on the quasi-one-dimensional Kondo lattice CeCo${}_2$Ga${}_8$
• Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures