Atomic motions in the layered copper pseudochalcogenide CuNCN indicative of a quantum spin-liquid scenario
| Autor: | Ralf P. Stoffel, Andrej Zorko, Philipp Jacobs, Andreas Houben, Richard Dronskowski, Andrei L. Tchougréeff, Matej Pregelj, Denis Arčon, Oksana Zaharko |
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| Rok vydání: | 2017 |
| Předmět: |
Condensed matter physics
Phonon Chemistry Neutron diffraction Nanotechnology 02 engineering and technology Inelastic scattering 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Heat capacity Inelastic neutron scattering Spinon 0103 physical sciences General Materials Science Neutron Quantum spin liquid 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal. 29(23) |
| ISSN: | 1361-648X |
| Popis: | We explore the thermodynamic properties of the layered copper(II) carbodiimide CuNCN by heat-capacity measurements and investigate the corresponding thermal atomic motions by means of neutron powder diffraction as well as inelastic neutron scattering. The experiments are complemented by a combination of density-functional calculations, phonon analysis and analytic theory. The existence of a soft flexural mode-bending of the layers, characteristic for the material structure-is established in the phonon spectrum of CuNCN by giving characteristic temperature-dependent contributions to the heat capacity and atomic displacement parameters. The agreement with the neutron data allows us to extract a residual-on top of the lattice-presumably spinon contribution to the heat capacity [Formula: see text], speaking in favor of the spin-liquid picture of the electronic phases of CuNCN. |
| Databáze: | OpenAIRE |
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