# Magnetism in the high-Tc analogue Cs2AgF4 studied with muon-spin relaxation

## TL;DR

This study investigates the magnetic properties of Cs2AgF4, a high-Tc analogue, using muon-spin relaxation, revealing intrinsic magnetic order below 13.95 K and insights into its magnetic coupling and critical behavior.

## Contribution

First muon-spin relaxation analysis of Cs2AgF4 demonstrating intrinsic magnetic order and detailed magnetic coupling characteristics.

## Key findings

- Magnetic order established below 13.95 K.
- Estimated inter- to intraplane coupling ratio |J'/J|=1.9 x 10^-2.
- Critical exponent beta=0.292 indicating intermediate 2D-3D magnetism.

## Abstract

We present the results of a muon-spin relaxation study of the high-Tc analogue material Cs2AgF4. We find unambiguous evidence for magnetic order, intrinsic to the material, below T_C=13.95(3) K. The ratio of inter- to intraplane coupling is estimated to be |J'/J|=1.9 x 10^-2, while fits of the temperature dependence of the order parameter reveal a critical exponent beta=0.292(3), implying an intermediate character between pure two- and three- dimensional magnetism in the critical regime. Above T_C we observe a signal characteristic of dipolar interactions due to linear F-mu-F bonds, allowing the muon stopping sites in this compound to be characterized.