# Pressure-induced spin-state ordering in Sr$_2$CoO$_3$F

## TL;DR

This paper theoretically investigates how pressure influences the low-temperature phases of Sr$_2$CoO$_3$F, revealing a novel spin-state ordered phase characterized by a checkerboard pattern of cobalt spin states.

## Contribution

It introduces a combined LDA+DMFT and strong-coupling model approach to identify a new spin-state ordered phase under pressure in Sr$_2$CoO$_3$F.

## Key findings

- Identification of a spin-state ordered phase under pressure
- Checkerboard arrangement of cobalt spin states
- Presence of paramagnetic and antiferromagnetic regimes

## Abstract

We study theoretically low-temperature phases of a recently synthesized compound Sr$_2$CoO$_3$F under pressure. The analysis combining LDA+DMFT and a strong-coupling effective model points to the existence of not only normal paramagnetic and antiferromagnetic regimes, but also a spin-state ordered phase in a certain range of applied pressure and low temperature. This order is characterized by a checkerboard arrangement of different spin states of cobalt atoms in the lattice.