Electron Spin Resonance of Defects in Spin Chains. o-(DMTTF)2X : a versatile system behaving like molecular magnet

TL;DR

This study uses Electron Paramagnetic Resonance to analyze defects in spin chains of o-(DMTTF)2X, revealing their correlated nature and similarities to molecular magnets, with insights into hyperfine interactions and exchange effects.

Contribution

It provides new insights into defect structures in spin chains and demonstrates the role of exchange interactions in hyperfine coupling reduction.

Findings

Defects exhibit strong correlation and structural similarity to molecular magnets.

Hyperfine coupling is significantly reduced due to exchange interactions.

The study combines experimental ESR data with DFT calculations for comprehensive analysis.

Abstract

The paper presents the Electron Paramagnetic Resonance study of defects in the spin chain o- (DMTTF)2X family using continuous wave and pulsed techniques. The defects in spin chains are strongly correlated and present similar microscopic structure as a molecular magnet. By means of 2D-HYSCORE and DFT calculations we show a strong reduction of hyperfine coupling between the defects and the nuclear spin bath. We assume that the reduction is due to the Heisenberg exchange interaction which screens the effect of the nuclei.