Ferrimagnetic 120∘magnetic structure inCu2OSO4
| Autor: | Markus Kriener, Virgile Favre, Nicola Casati, L. Yang, Matthias Frontzek, Pascal Manuel, G. S. Tucker, Romain Sibille, Arnaud Magrez, Henrik M. Rønnow, Helmuth Berger, Clemens Ritter, Ivica Živković |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Magnetic structure Condensed matter physics Neutron diffraction 02 engineering and technology Neutron scattering Spin structure 021001 nanoscience & nanotechnology 01 natural sciences Ferromagnetism Ferrimagnetism 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Ground state Single crystal |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.102.094422 |
| Popis: | We report magnetic properties of a $3{d}^{9}$ $({\mathrm{Cu}}^{2+})$ magnetic insulator ${\mathrm{Cu}}_{2}{\mathrm{OSO}}_{4}$ measured on both powder and single crystal. The magnetic atoms of this compound form layers whose geometry can be described either as a system of chains coupled through dimers or as a kagome lattice where every third spin is replaced by a dimer. Specific heat and DC susceptibility show a magnetic transition at 20 K, which is also confirmed by neutron scattering. Magnetic entropy extracted from the specific heat data is consistent with an $S=1/2$ degree of freedom per ${\mathrm{Cu}}^{2+}$, and so is the effective moment extracted from DC susceptibility. The ground state has been identified by means of neutron diffraction on both powder and single crystal and corresponds to an $\ensuremath{\sim}{120}^{\ensuremath{\circ}}$ spin structure in which ferromagnetic intradimer alignment results in a net ferrimagnetic moment. No evidence is found for a change in lattice symmetry down to 2 K. Our results suggest that ${\mathrm{Cu}}_{2}{\mathrm{OSO}}_{4}$ represents a type of model lattice with frustrated interactions where interplay between magnetic order, thermal and quantum fluctuations can be explored. |
| Databáze: | OpenAIRE |
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