Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 101: Correlated Electrons: Other Materials
TT 101.8: Vortrag
Donnerstag, 15. März 2018, 17:30–17:45, HFT-FT 101
Magnetic Properties and Spin Dynamics of Defects in Organic Spin Chain Systems as Probed by ESR Spectroscopy — •Julian Zeisner1,2, Sylvain Bertaina3, Olivier Pilone3, Hervé Vezin4, Olivier Jeannin5, Marc Fourmigué5, Bernd Büchner1,2, and Vladislav Kataev1 — 1IFW Dresden, D-01069 Dresden, Germany — 2IFMP, TU Dresden, D-01069 Dresden, Germany — 3Aix-Marseille Université, CNRS, IM2NP UMR7334, F-13397 Marseille, France — 4LASIR, UMR-CNRS 8516, Université de Lille 1, F-59655 Villeneuve d Ascq, France — 5ISCR, Université de Rennes 1, UMR-CNRS 6226, F-35042 Rennes, France
Defects in 1D spin systems continue to be an active field of solid state research as they are able to alter magnetic properties of the hosting materials drastically. In this work we studied the spin dynamics of defects in the spin chain compounds (o -DMTTF)2X (X = Br, Cl) by means of ESR spectroscopy. Both materials exhibit spin-Peierls transitions at temperatures around 60 K, which allow a separation of the properties of defects inside the chains from the magnetic response of the spin chains. Temperature dependent CW ESR measurements evidence the evolution of spin dynamics from being governed by the spins in the chains at elevated temperatures to a low-temperature regime which is dominated by defects within the chains. Moreover, details of spin dynamics deep in the spin-Peierls phase were investigated by pulse ESR experiments which revealed Rabi-oscillations as well as anisotropic relaxation behaviour of the spins. We discuss the obtained results in terms of solitons localized at the defect sites.