Mesoscopic Magnetic States in Metallic Alloys with Strong Electronic Correlations: A Percolative Scenario for CeNi$_{1-x}$Cu$_{x}$

TL;DR

This paper investigates the magnetic states in CeNi$_{1-x}$Cu$_{x}$ alloys, revealing mesoscopic magnetic clusters and a percolative transition to ferromagnetism, supported by neutron scattering and magnetization experiments.

Contribution

It introduces a percolative model explaining the transition from cluster-glass to ferromagnetic order in strongly correlated alloys with disorder.

Findings

Identification of ~20 Å magnetic clusters

Observation of staircase hysteresis cycles at 100 mK

Long-range ferromagnetic order without a sharp Curie transition

Abstract

We present evidence for the existence of magnetic clusters of approximately 20 \AA in the strongly correlated alloy system CeNi$_{1-x}$Cu$_{x}$ (0.7 $\le$ x $\le$ 0.2) based on small angle neutron scattering experiments as well as the occurrence of staircase-like hysteresis cycles during very low temperature (100 mK) magnetization measurements. An unusual feature is the observation of long-range ferromagnetic order below the cluster-glass transition without any indication of a sharp transition at a Curie temperature. These observations strongly support a phenomenological model where a percolative process connects the cluster-glass state observed at high temperatures with the long-range ferromagnetic order observed by neutron diffraction experiments at very low temperatures. The model can account for all the puzzling macroscopic and microscopic data previously obtained in this system, providing a new perspective with regard to the magnetic ground state of other alloyed compounds with small magnetic moments or weak ferromagnetism with intrinsic disorder effects.