NMR Evidence for Antiferromagnetic Transition in the Single-Component Molecular Conductor, [Au(tmdt)_{2}] at 110 K

TL;DR

This study uses NMR to reveal a magnetic phase transition at 110 K in the single-component molecular conductor [Au(tmdt)_{2}], indicating strong electron correlations and a high-temperature antiferromagnetic transition among organic conductors.

Contribution

First microscopic NMR evidence of a magnetic transition at 110 K in [Au(tmdt)_{2}], highlighting its highly correlated metallic state.

Findings

NMR line width increases sharply at 110 K

Peak in nuclear spin-lattice relaxation rate at 110 K

Indicates a magnetic phase transition in the material

Abstract

We present the results of a ^{1}H NMR study of the single-component molecular conductor, [Au(tmdt)_{2}]. A steep increase in the NMR line width and a peak formation of the nuclear spin-lattice relaxation rate, 1/T_{1}, were observed at around 110 K. This behavior provides clear and microscopic evidences for a magnetic phase transition at considerably high temperature among organic conductors. The observed variation in 1/T_{1} with respect to temperature indicates the highly correlated nature of the metallic phase.