Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 49: Correlated Electrons: Low-dimensional Systems - Materials 4

TT 49.2: Vortrag

Freitag, 30. März 2012, 09:45–10:00, H 3005

Spin and lattice dynamics in the low-dimensional quantum magnet (NO)Cu(NO₃)₃ — Vladimir Gnezdilov¹, •Dirk Wulferding², Peter Lemmens², Yurii Pashkevich³, Olga Volkova⁴, Igor Morozov⁴, and Alexander Vasiliev⁴ — ¹ILTPE NAS, Ukraine — ²IPKM, TU-BS, Braunschweig, Germany — ³DonFTI, Donetsk, Ukraine — ⁴MSU, Moscow, Russia

We present excitation spectra of (NO)Cu(NO₃)₃, a topological realization of the 2D Nersesyan-Tsvelik model with possible RVB or VBC ground states. The phonons display a temperature dependence and anomalies due to strong spin-lattice coupling which has not been considered in previous investigations. In addition, a broad magnetic continuum is observed and used to investigate the spin dynamics. Work supported by DFG, B-IGSM and NTH School for Contacts in Nanosystems.