Quantum magnetic properties and metal-to-insulator transition in chemically doped calcium ruthenate perovskite

TL;DR

This paper reviews quantum magnetic phenomena and metal-insulator transitions in chemically doped calcium ruthenate perovskite, highlighting the complex magnetic fluctuations and quantum behaviors observed in these materials.

Contribution

It provides a comprehensive overview of quantum magnetic properties and metal-insulator transitions in calcium ruthenate with various dopants, emphasizing new experimental insights.

Findings

Non-Fermi liquid behavior in CaRuO₃

Quantum magnetic fluctuations in doped compounds

Persistent continuum fluctuations in cobalt-doped CaRuO₃

Abstract

Ruthenates provide comprehensive platform to study a plethora of novel properties, such as quantum magnetism, superconductivity and magnetic fluctuation mediated metal-insulator transition. In this article, we provide an overview of quantum mechanical phenomenology in calcium ruthenium oxide with varying compositions. While the stochiometric composition of CaRuO$_{3}$ exhibits non-Fermi liquid behavior with quasi-criticality, chemically doped compounds depict prominent signatures of quantum magnetic fluctuations at low temperature that in some cases are argued to mediate in metal-insulator transition. In the case of cobalt doped- CaRuO$_{3}$, an unusual continuum fluctuation is found to persist deep inside the glassy phase of the material. These observations reflect the richness of ruthenate research platform in the study of quantum magnetic phenomena of fundamental importance.