Pressure tuning of putative quantum criticality on YbV6Sn6

P. C. Sabino; L. Mendonça-Ferreira; J. G. Dias; G. G. Vasques; M. Dutra; H. Pizzi; P. G. Pagliuso; M. A. Avila

paper

Pressure tuning of putative quantum criticality on YbV6Sn6

arXiv:2509.09817

Abstract

YbV $_{6}$ Sn $_{6}$ is a recently discovered heavy-fermion compound that orders at T $_{N} \approx 0.4$ K and exhibits a magnetic field-tuned quantum critical point at $H \approx 10$ kOe. In this work, we have grown YbV $_{6}$ Sn $_{6}$ single crystals by the self-flux method, to investigate their physical properties at ambient pressure and their electrical transport properties under hydrostatic pressure. At higher temperatures, we observed a decrease in the Kondo temperature, accompanied by the appearance of a local minimum followed by a local maximum, associated with the onset of the coherent Kondo regime. Power law fitting at low temperatures indicated a recovery of the Fermi-liquid regime for pressures below 1 GPa. Above 1 GPa, a reentrance of non-Fermi-liquid behavior is suggested by a decrease in the exponent $n$ , accompanied by a substantial increase in the parameter $A$ , indicating the approach of a new quantum criticality tuned by hydrostatic pressure. The broad range of interactions present in YbV $_{6}$ Sn $_{6}$ , including RKKY, crystalline electric field (CEF), and Kondo lattice effects, appears to lead to a complex phase diagram. We present a putative phase diagram featuring double quantum criticality tuned by both magnetic field and hydrostatic pressure.