High pressure effects on the electrical resistivity behavior of the Kondo lattice, YbPd2Si2

TL;DR

This study investigates how applying external pressure up to 8 GPa affects the electrical resistivity of YbPd2Si2, revealing pressure-induced magnetic ordering and valence fluctuation transitions in a Yb-based Kondo lattice.

Contribution

It demonstrates that external pressure can induce magnetic ordering in YbPd2Si2, a stoichiometric Yb-based Kondo lattice, showing a transition from valence fluctuation to magnetic order.

Findings

Resistivity shows quadratic temperature dependence below 15 K.

A resistivity drop occurs below 0.5 K at 1 GPa, indicating magnetic ordering.

The temperature of this drop peaks at 8 K around 2 GPa, following Doniach's phase diagram.

Abstract

We report the influence of external pressure (P= up to 8 GPa) on the temperature dependence of electrical resistivity of a Yb-based Kondo lattice, YbPd2Si2, which does not undergo magnetic ordering under ambient pressure condition. There are qualitative changes in the temperature dependence of electrical resistivity due to the application of external pressure. While the resistivity is found to vary quadratically below 15 K (down to 45 mK) characteristic of Fermi-liquids, a drop is observed below 0.5 K for P= 1 GPa. Since the resistance values do not attain zero, we are attempted to attribute this drop to magnetic ordering, rather than to superconductivity. The temperature at which this fall occurs goes through a peak as a function of P (8 K for2 GPa and about 5 K at higher pressures). mimicking Doniach's magnetic phase diagram. We conclude that this is one of the few Yb-based stoichiometric materials, in which one can travers from valence fluctuation to magnetic ordering by the application of external pressure.