Magnetic ground state of the frustrated spin- 12 chain compound β–TeVO4 at high magnetic fields
| Autor: | Matej Pregelj, Oleksandr Prokhnenko, Helmuth Berger, Denis Arčon, Martin Klanjšek, Andrej Zorko, Hiroyuki Nojiri, Jonathan S. White, Oksana Zaharko, Maciej Bartkowiak |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed matter physics Isotropy Neutron diffraction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Magnetization Liquid crystal 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Anisotropy Ground state Phase diagram |
| Zdroj: | Physical Review B. 100 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.100.094433 |
| Popis: | Frustrated spin-1/2 chains, despite the apparent simplicity, exhibit remarkably rich phase diagram comprising vector-chiral (VC), spin-density-wave (SDW) and multipolar/spin-nematic phases as a function of the magnetic field. Here we report a study of $\beta$-TeVO$_4$, an archetype of such compounds, based on magnetization and neutron diffraction measurements up to 25 T. We find the transition from the helical VC ground state to the SDW state at $\sim$3 T for the magnetic field along the $a$ and $c$ crystal axes, and at $\sim$9 T for the field along the $b$ axis. The high-field (HF) state, existing above $\sim$18 T, i.e., above $\sim$1/2 of the saturated magnetization, is an incommensurate magnetically ordered state and not the spin-nematic state, as theoretically predicted for the isotropic frustrated spin-1/2 chain. The HF state is likely driven by sizable interchain interactions and symmetric intrachain anisotropies uncovered in previous studies. Consequently, the potential existence of the spin nematic phase in $\beta$-TeVO$_4$ is limited to a narrow field range, i.e., a few tenths of a tesla bellow the saturation of the magnetization, as also found in other frustrated spin-1/2 chain compounds. |
| Databáze: | OpenAIRE |
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