Academic literature on the topic '(o−DMTTF)2X'

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Journal articles on the topic "(o−DMTTF)2X"

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Jankowski, D., R. Świetlik, M. Fourmigué, and E. W. Reinheimer. "Infrared and Raman studies of quasi-one-dimensional conductors (o-DMTTF)2X (X=Br, I)." Physica B: Condensed Matter 405, no. 11 (June 2010): S131—S133. http://dx.doi.org/10.1016/j.physb.2009.10.053.

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Fourmigué, Marc, Eric W. Reinheimer, Kim R. Dunbar, Pascale Auban-Senzier, Claude Pasquier, and Claude Coulon. "A series of strongly one-dimensional organic metals with strictly uniform stacks: (o-DMTTF)2X (X = Cl, Br, I)." Dalton Transactions, no. 34 (2008): 4652. http://dx.doi.org/10.1039/b805511d.

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Pouget, Jean-Paul. "Spin-Peierls, Spin-Ladder and Kondo Coupling in Weakly Localized Quasi-1D Molecular Systems: An Overview." Magnetochemistry 9, no. 2 (February 13, 2023): 57. http://dx.doi.org/10.3390/magnetochemistry9020057.

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We review the magneto-structural properties of electron–electron correlated quasi-one- dimensional (1D) molecular organics. These weakly localized quarter-filled metallic-like systems with pronounced spin 1/2 antiferromagnetic (AF) interactions in stack direction exhibit a spin charge decoupling where magnetoelastic coupling picks up spin 1/2 to pair into S = 0 singlet dimers. This is well illustrated by the observation of a spin-Peierls (SP) instability in the (TMTTF)2X Fabre salts and related salts with the o-DMTTF donor. These instabilities are revealed by the formation of a pseudo-gap in the spin degrees of freedom triggered by the development of SP structural correlations. The divergence of these 1D fluctuations, together with the interchain coupling, drive a 3D-SP ground state. More surprisingly, we show that the Per2-M(mnt)2 system, undergoing a Kondo coupling between the metallic Per stack and the dithiolate stack of localized AF coupled spin ½ (for M = Pd, Ni, Pt), enhances the SP instability. Then, we consider the zig-zag spin ladder DTTTF2-M(mnt)2 system, where unusual singlet ground state properties are due to a combination of a 4kF charge localization effect in stack direction and a 2kF SP instability along the zig-zag ladder. Finally, we consider some specific features of correlated 1D systems concerning the coexistence of symmetrically different 4kF BOW and 4kF CDW orders in quarter-filled organics, and the nucleation of solitons in perturbed SP systems.
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Zeisner, J., O. Pilone, L. Soriano, G. Gerbaud, H. Vezin, O. Jeannin, M. Fourmigué, B. Büchner, V. Kataev, and S. Bertaina. "Coherent spin dynamics of solitons in the organic spin chain compounds (o-DMTTF)2X(X=Cl,Br)." Physical Review B 100, no. 22 (December 16, 2019). http://dx.doi.org/10.1103/physrevb.100.224414.

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Foury-Leylekian, P., P. Auban-Senzier, C. Coulon, O. Jeannin, M. Fourmigué, C. Pasquier, and J. P. Pouget. "Phase diagram of the correlated quarter-filled-band organic salt series (o-DMTTF)2X(X = Cl, Br, I)." Physical Review B 84, no. 19 (November 28, 2011). http://dx.doi.org/10.1103/physrevb.84.195134.

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Soriano, L., O. Pilone, M. D. Kuz'min, H. Vezin, O. Jeannin, M. Fourmigué, M. Orio, and S. Bertaina. "Electron-spin interaction in the spin-Peierls phase of the organic spin chain ( o -DMTTF) 2X ( X =Cl, Br, I)." Physical Review B 105, no. 6 (February 28, 2022). http://dx.doi.org/10.1103/physrevb.105.064434.

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Dissertations / Theses on the topic "(o−DMTTF)2X"

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Soriano, Loïc. "Etude par résonance paramagnétique électronique de la cohérence de spin dans les composés organiques (o-DMTTF)2X (X = CI, BR,I,NO2 et NO3)." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0514.

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Cette thèse est une étude par résonance paramagnétique électronique (RPE) des sels organiques quasi-unidimensionnels (o-DMTTF)2X (X = Cl, Br, I, NO2 et NO3). D'un point de vue magnétique ces composés sont des chaînes de spins 1/2 avec un couplage antiferromagnétique et subissent une transition de spin-Peierls en dessous de T < TSP . A haute température, nous avons étudié le comportement des chaînes uniformes. Pendant la transition de spin-Peierls, nous avons déterminé la dépendance en température du gap de spin-Peierls et de la dimérisation des chaînes. A basse température, nous avons montré l'existence des défauts intrinsèques piégeant des solitons magnétiques. Nous avons également observé que 50 % solitons sont isolés et 50 % forment des paires par un fort couplage d'échange. Par la suite, la mesure des oscillations de Rabi nous a permis de montrer que les solitons et les paires de solitons ont respectivement une dynamique cohérente de spin 1/2 et de spin 1. Dans un deuxième temps nous avons étudié les mécanismes de décohérence et de relaxation dans les chaînes de spins par des séquences de RPE pulsée . Pour cela nous avons identifié les processus de relaxation intervenant dans le temps de relaxation spin-réseau T1, certains composés suivent un processus Orbach et d'autres Raman. Nous avons identifé et quantifé la décohérence causée par les interactions spin-spin comme la diffusion spectrale et instantanée. Cette étude nous a permis de conclure que notre système possède un temps de cohérence intrinsèque et peu sensible à la concentration en défauts. Ces travaux tentent de concilier la physique des aimants fortement corrélés et celles des systèmes magnétiques dilués
This thesis focuses on the electron paramagnetic resonance (EPR) study of the one-dimensionnal organic salts (o-DMTTF)2X with centrosymmetric (X = Cl, Br and I) andnon centrosymmetric (X = NO2, NO3) counteranions. These organic compounds are antiferromagnetic spin 1/2 chains and below TSP a spin-Peierls transition occurs. At high temperature we have studied their uniform spin chains behavior. During spin-Peierls transition, we have determined the spin gap and dimerisation temperature dependences. At lower temperature we have provided evidence of intrinsic defects which pinned magnetic solitons. We have shown that the one-half of the total number of solitons are in isolation whereas the other half form pairs with a strong magnetic coupling. The Rabi oscillations of both the single-soliton and the soliton-dimer have been observed and they have respectly the spin dynamics of spin 1/2 and spin 1. In a second time, by means of pulse EPR sequences we have studied decoherence and spin relaxation mechanisms in spin chains. For this purpose we have identified relaxation processes involved in the spin-lattice relaxation, the dominant process is sometimes Orbach next time Raman. We have identified and quantified electron spin decoherence sources like spectral and instantaneous diffusion. We have found that our system has an intrinsic coherence lifetime not related to the concentration of defects. This work tries to make the connection between strongly correlated magnets and diluted spin systems
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