Electron Spin Resonance of Defects in Spin Chains— o-(DMTTF)2X: A Versatile System Behaving Like Molecular Magnet

Loic Soriano (1, 2) , Julian Zeisner (3, 4) , Vladislav Kataev (3) , Olivier Pilone (1) , Marc Fourmigue (5) , Olivier Jeannin (5) , Herve Vezin (6, 7) , Maylis Orio (8, 2) , Sylvain Bertaina (1)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 AMU - Aix Marseille Université
3 IFW Dresden - Leibniz Institute for Solid State and Materials Research
4 TU Dresden - Technische Universität Dresden = Dresden University of Technology
5 ISCR - Institut des Sciences Chimiques de Rennes
6 LASIRE - Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516
7 Université de Lille
8 ISM2 - Institut des Sciences Moléculaires de Marseille

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.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Loic Soriano, Julian Zeisner, Vladislav Kataev, Olivier Pilone, Marc Fourmigue, et al.. Electron Spin Resonance of Defects in Spin Chains— o-(DMTTF)2X: A Versatile System Behaving Like Molecular Magnet. Applied Magnetic Resonance, 2020, 51 (11), pp.1307-1320. ⟨10.1007/s00723-020-01245-7⟩. ⟨hal-02999563⟩