Electron spins interaction in the spin-Peierls phase of the organic spin chain (o-DMTTF)2X (X = Cl, Br, I)

• Published in: Physical Review B
• Main Authors: Soriano, Loic, Pilone, Olivier, Kuz'Min, Michael D., D, Vezin, Herve, Jeannin, Olivier, Fourmigué, Marc, Orio, Maylis, Bertaina, Sylvain
• Other Authors: Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 (LASIRE), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Agence Nationale de la RechercheCNRS -- IR INFRANALYTICS FR2054, ANR-20-CE29-0011,DYSCORDE,Dynamique des défauts fortement corrélés dans les aimants organiques(2020)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2022
• Subjects: EPR - Electron paramagnetic resonance; ESR / EPR; Spin chains; Spin-Peierls; Qubits; Qubit pair; Defects; Spin gap; Quantum coherence; pulsed EPR; DFT; ORCA; [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]; [PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]; Orca
• Online Access: https://hal.science/hal-03578624; https://hal.science/hal-03578624/document; https://hal.science/hal-03578624/file/DMTTF_Arvix.pdf; https://doi.org/10.1103/PhysRevB.105.064434

International audience We investigate the electron spin resonance of the organic spin-Peierls chain (o-DMTTF)2X with X = Cl, Br and I. We describe the temperature dependence of the spin gap during the phase transition and quantify the dimerization parameter δ. At the lowest temperatures, the susceptibility is governed by defects in the spin dimerized chain. Such strongly correlated defects are the consequence of breaks in the translational symmetry of the chain. In the vicinity of the defects the spins are polarized antiferomagnetically forming a magnetic soliton: a spin 1 2 quasi-particle of size ruled by δ pinned to the defects. For (o-DMTTF)2Br and (o-DMTTF)2Cl, we show that the one-half of the total number of solitons are in isolation (as singles) whereas the other half form pairs (soliton dimers)with a strong magnetic coupling. The Rabi oscillations of both the single-soliton and the soliton-dimer are observed, which is a prerequisite in the context of quantum information.