Spin order in the Heisenberg kagome antiferromagnet MgFe3(OH)6Cl2
| Autor: | Tatsuya Kawae, Masayoshi Fujihala, Koichi Kindo, Takashi Kamiyama, X. G. Zheng, Sanghyun Lee, Akira Matsuo |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Muon Pyrochlore Order (ring theory) 02 engineering and technology Spin structure engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Magnetization Crystallography 0103 physical sciences engineering Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Realization (systems) Spin-½ |
| Zdroj: | Physical Review B. 96 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.96.144111 |
| Popis: | Spin behaviors on kagome lattices have received increased attention because of their exotic magnetic states. Here, we report magnetic ordering in the $S=2$ kagome antiferromagnet $\mathrm{MgF}{\mathrm{e}}_{3}{(\mathrm{OH})}_{6}\mathrm{C}{\mathrm{l}}_{2}$. The compound has been synthesized by selectively replacing the magnetic ions in the triangular planes of its parent compound of deformed pyrochlore $\mathrm{F}{\mathrm{e}}_{2}{(\mathrm{OH})}_{3}\mathrm{Cl}$ with nonmagnetic Mg. Whereas $\mathrm{F}{\mathrm{e}}_{2}{(\mathrm{OH})}_{3}\mathrm{Cl}$ showed antiferromagnetic order below ${T}_{\mathrm{N}}=8.5\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ with persistent spin fluctuations, $\mathrm{MgF}{\mathrm{e}}_{3}{(\mathrm{OH})}_{6}\mathrm{C}{\mathrm{l}}_{2}$ showed an antiferromagnetic transition at an enhanced ${T}_{\mathrm{N}}$ value of 9.9 K. Susceptibility, high-field magnetization, and neutron-diffraction studies suggest that $\mathrm{MgF}{\mathrm{e}}_{3}{(\mathrm{OH})}_{6}\mathrm{C}{\mathrm{l}}_{2}$ is a Heisenberg-like spin system with a ${120}^{\ensuremath{\circ}}$ nearest-neighbor spin structure confined in the kagome plane and spin-vector chirality of $q=\ensuremath{-}1$ below ${T}_{\mathrm{N}}$. Muon spin-rotation/-relaxation studies demonstrate that the persisting spin fluctuations are suppressed relative to $\mathrm{F}{\mathrm{e}}_{2}{(\mathrm{OH})}_{3}\mathrm{Cl}$. The present paper reports the experimental realization of an $S=2$ kagome antiferromagnet, highlighting a real system with a quasiclassical Heisenberg spin, which may also be a valuable reference system for quantum Heisenberg kagome antiferromagnets. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|