# The magnetic and electronic properties of Oxyselenides - influence of transition metal ions and lanthanides

## TL;DR

This review discusses how lanthanides and transition metal ions influence the magnetic and electronic properties of oxyselenides, highlighting their potential connection to strongly correlated phenomena and similarities to other unconventional superconductors.

## Contribution

It provides a comprehensive overview of the current understanding of oxyselenides' magnetic and electronic behaviors, emphasizing the role of different metal ions and comparing them to related superconducting systems.

## Key findings

- Lanthanides and transition metals significantly affect oxyselenides' properties.
- Oxyselenides share structural similarities with unconventional superconductors.
- Strong interplay between magnetism and electronic phases observed.

## Abstract

Magnetic oxyselenides have been the topic of research for several decades being first of interest in the context of photoconductivity and thermoelectricity owing to their intrinsic semiconducting properties and ability to tune the energy gap through metal ion substitution. More recently, interest in the oxyselenides has experienced a resurgence owing to the possible relation to strongly correlated phenomena given the fact that many oxyslenides share a similar structure to unconventional superconducting pnictides and chalcogenides. The two dimensional nature of many oxyselenide systems also draws an analogy to cuprate physics where a strong interplay between unconventional electronic phases and localised magnetism has been studied for several decades. It is therefore timely to review the physics of the oxyselenides in the context of the broader field of strongly correlated magnetism and electronic phenomena. Here we review the current status and progress in this area of research with the focus on the influence of lanthanides and transition metal ions on the intertwined magnetic and electronic properties of oxyselenides. The emphasis of the review is on the magnetic properties and comparisons are made with iron based pnictide and chalcogenide systems.