Collapse of Kondo state and ferromagnetic quantum phase transition in YbFeZn
arXiv:1808.01367 · doi:10.1103/PhysRevB.98.174405
Abstract
We present the electrical resistivity data under application of pressures up to 26 GPa and down to 50 mK temperatures on YbFeZn. We find a pressure induced magnetic phase transition with an onset at =18.20.8 GPa. At ambient pressure, YbFeZn manifests a heavy fermion, nonmagnetic ground state and the Fermi liquid behavior at low temperatures. As pressure is increased, the power law exponent in resistivity, , deviates significantly from Fermi liquid behavior and tends to saturate with = 1 near . A pronounced resistivity maximum, , which scales with Kondo temperature is observed. decreases with increasing pressure and flattened out near indicating the suppression of Kondo exchange interaction. For , shows a sudden upward shift, most likely becoming associated with crystal electric field scattering. Application of magnetic field for broadens the transition and shifts it toward the higher temperature, which is a typical behavior of the ferromagnetic transition. The magnetic transition appears to abruptly develop above , suggesting probable first-order (with changing pressure) nature of the transition; once stabilized, the ordering temperature does not depend on pressure up to 26 GPa. Taken as a whole, these data suggest that YbFeZn has a quantum phase transition at = 18.2 GPa associated with the avoided quantum criticality in metallic ferromagnets.
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