Ferromagnetic Cluster Glass Phase Embedded in a Paramagnetic and Metallic Host in Non-uniform Magnetic System CaRu_{1-x}Sc_{x}O_{3}

TL;DR

This study reveals a ferromagnetic cluster glass phase in CaRu_{1-x}Sc_{x}O_{3}, characterized by frequency-dependent susceptibility and slow magnetization relaxation, indicating a uniform distribution of magnetic clusters within a paramagnetic metallic host.

Contribution

It demonstrates the presence of a ferromagnetic cluster glass state in a non-uniform magnetic system and suggests a uniform distribution of clusters rather than chemical segregation as the cause.

Findings

Identification of a ferromagnetic cluster glass state below 40 K.

Frequency-dependent peak in ac magnetic susceptibility.

Slow relaxation of magnetization indicating glassy dynamics.

Abstract

We have investigated both static and dynamic magnetic properties of polycrystalline CaRu$_{1-x}$Sc$_{x}$O$_{3}$ system in order to clarify the role of Sc ions as a disorder for magnetic ordering. We have observed typical features of a ferromagnetic cluster glass state below around 40 K: (i) a broad, frequency-dependent peak in the ac magnetic susceptibility, (ii) a slow relaxation of the magnetization, and (iii) a continuous increase in the dc magnetic susceptibility in field cooling process. The composition dependence of characteristic parameters for the cluster glass state suggests that chemical segregation can hardly explain the clustering mechanism. We propose a possible picture that the ferromagnetic clusters are distributed uniformly and form the glassy state embedded in the paramagnetic and metallic host of CaRuO$_{3}$.