Spin-coupling topology in the copper hexamer compounds A2Cu3O(SO4)3 (A=Na, K)
| Autor: | Juan M. Clemente-Juan, H. U. Güdel, Ekaterina Pomjakushina, Albert Furrer, A. Podlesnyak |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Excitation spectra chemistry.chemical_element Order (ring theory) Coupling topology 02 engineering and technology Random hexamer 021001 nanoscience & nanotechnology 01 natural sciences Copper Inelastic neutron scattering Crystallography chemistry 0103 physical sciences Antiferromagnetism 010306 general physics 0210 nano-technology Spin (physics) |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | The compounds ${A}_{2}\mathrm{C}{\mathrm{u}}_{3}\mathrm{O}{(\mathrm{S}{\mathrm{O}}_{4})}_{3}$ $(A=\mathrm{Na},\phantom{\rule{0.16em}{0ex}}\mathrm{K})$ are characterized by copper hexamers that are weakly coupled to realize antiferromagnetic order below ${T}_{N}\ensuremath{\approx}3\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. They constitute quantum spin systems with $S=1$ triplet ground states. We investigated the energy-level splittings of the copper hexamers by inelastic neutron scattering experiments covering the entire range of the magnetic excitation spectra. The observed transitions are governed by very unusual selection rules that we ascribe to the underlying spin-coupling topology. This is rationalized by model calculations that allow an unambiguous interpretation of the magnetic excitations concerning both the peak assignments and the nature of the spin-coupling parameters. |
| Databáze: | OpenAIRE |
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