Low-Temperature High-Resolution Solid-State (cryoMAS) NMR of Han Purple BaCuSi2O6 |
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Authors: | Raivo Stern Ivo Heinmaa Enno Joon Alexander A Tsirlin Hiroyuki Nakamura Tsuyoshi Kimura |
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Institution: | 1. National Institute of Chemical Physics and Biophysics (NICPB), Akadeemia tee 23, Tallinn, 12618, Estonia 2. Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
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Abstract: | We present low-temperature (low-T, sub-liquid-N2) high-speed high-resolution 29Si solid-state (cryoMAS) nuclear magnetic resonance studies on a model 2D-BEC quantum magnet BaCuSi2O6, known also as Han Purple. We observe broadened 29Si lines below the well-established 100 K structural phase transition confirming the existence of inhomogeneities at low temperatures. Interestingly, the low-T spectra of \({\mathrm{BaCuSi}}_{2}{\mathrm{O}}_{6}\) closely resemble those of the novel compound Ba2CoSi2O6Cl2 taken at room temperature. This suggests that the Co compound features structural modulations or inhomogeneities already at room temperature. The low-T crystal structure and magnetism of \({\mathrm{BaCuSi}}_{2}{\mathrm{O}}_{6}\) are more complex than previously believed, and deserve further investigation. |
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