Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.78: Poster
Wednesday, March 14, 2018, 15:00–19:00, Poster B
Spin dynamics in a honeycomb compound probed by magnetic resonance technique — •Margarita Iakovleva1,2, Hans-Joachim Grafe1, Angela Möller3, T. Taetz4, Evgeniia Vavilova2, Bernd Büchner1, and Vladislav Kataev1 — 1IFW Dresden, Dresden, 01069, Germany — 2KPhTI, Kazan, 420029, Russia — 3IAAC, JGU Mainz, Mainz, 55128, Germany — 4Institut für Anorganische Chemie, Universität zu Köln, Köln, 50939, Germany
The S=1/2 Heisenberg antiferromagnet InCu2/3V1/3O3 appears to be a rare model of a honeycomb lattice compound with very weak interlayer couplings. Previous magnetization and Electron Spin Resonance (ESR) studies on this compound have revealed signatures of an antiferromagnetic transition at TN = 38 K [1,2]. In our study, we used Nuclear Quadrupolar Resonance (NQR) and Nuclear Magnetic Resonance (NMR) techniques to investigate the local magnetic properties of InCu2/3V1/3O3. The 115In NMR as well as NQR spectra show a line splitting at T<TN which is a signature of the development of local magnetic fields in the vicinity of a magnetic phase transition. The T-dependence of the longitudinal relaxation rate T1−1 shows a characteristic sharp peak upon approaching TN = 38 K. Remarkably, with further decreasing temperature a second peak develops at T* = 15 K. We discuss this peculiar feature and possible scenarios of magnetic order in InCu2/3V1/3O3.
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M. Yehia, et al., Phys. Rev. B, 81, 060414 (2010)