Muon-Spin Spectroscopy of the organometallic spin 1/2 kagome-lattice compound Cu(1,3-benzenedicarboxylate)

TL;DR

This study uses muon spin resonance to investigate the magnetic properties of a kagome-lattice compound, revealing slow spin fluctuations and a lack of long-range order at very low temperatures, supporting its role as a model kagome magnet.

Contribution

First muon spin resonance analysis of Cu(1,3-benzenedicarboxylate), demonstrating its quasi-static spin state and potential as a model kagome system.

Findings

Spin fluctuations slow down below 1.8 K

No long-range magnetic order observed at low temperatures

Spin fluctuation rate approximately 3.6 1/usec

Abstract

Using muon spin resonance we examine the organometallic hybrid compound Cu(1,3-benzenedicarboxylate) [Cu(1,3-bdc)], which has structurally perfect spin 1/2 copper kagome planes separated by pure organic linkers. This compound has antiferromagnetic interactions with Curie-Weiss temperature of -33 K. We found slowing down of spin fluctuations starting at T=1.8 K, and that the state at T->0 is quasi-static with no long-range order and extremely slow spin fluctuations at a rate of 3.6 1/usec. This indicates that Cu(1,3-bdc) behaves as expected from a kagome magnet and could serve as a model kagome compound.