Abstract
The magnetic nature of a quasi-one-dimensional compound, ${\mathrm{BaVSe}}_{3}$, has been investigated with positive muon spin rotation and relaxation (${\ensuremath{\mu}}^{+}\mathrm{SR}$) measurements at ambient and high pressures. At ambient pressure, the ${\ensuremath{\mu}}^{+}\mathrm{SR}$ spectrum recorded under zero external magnetic field exhibited a clear oscillation below the Curie temperature (${T}_{C}\ensuremath{\sim}41\phantom{\rule{0.16em}{0ex}}\mathrm{K}$) due to the formation of quasistatic ferromagnetic order. The oscillation consisted of two different muon spin precession signals, indicating the presence of two magnetically different muon sites in the lattice. However, the two precession frequencies, which correspond to the internal magnetic fields at the two muon sites, could not be adequately explained with relatively simple ferromagnetic structures using the muon sites predicted by density functional theory calculations. The detailed analysis of the internal magnetic field suggested that the V moments align ferromagnetically along the $c$ axis but slightly canted toward the $a$ axis by ${28}^{\ensuremath{\circ}}$ that is coupled antiferromagnetically. The ordered V moment (${\mathbit{M}}_{\mathrm{V}}$) is estimated as (0.59, 0, 1.11) ${\ensuremath{\mu}}_{\mathrm{B}}$. As pressure increased from ambient pressure, ${T}_{C}$ was found to decrease slightly up to about 1.5 GPa, at which point ${T}_{C}$ started to increase rapidly with the further increase of the pressure. Based on a strong ferromagnetic interaction along the $c$ axis, the high-pressure ${\ensuremath{\mu}}^{+}\mathrm{SR}$ result revealed that there are two magnetic interactions in the $ab$ plane; one is an antiferromagnetic interaction that is enhanced with pressure, mainly at pressures below 1.5 GPa, while the other is a ferromagnetic interaction that becomes predominant at pressures above 1.5 GPa.
Highlights
In the quasi-one-dimensional (Q1D) triangular compounds, in which the 1D ferromagnetic (FM) interaction along the c axis is stronger than the two-dimensional (2D) FM and/or antiferromagnetic (AF) interactions in the ab plane, the magnetic ground state is naturally determined by the competition between the 2D-FM and 2D-AF interactions
The detailed analysis of the internal magnetic field suggested that the V moments align ferromagnetically along the c axis but slightly canted toward the a axis by 28◦ that is coupled antiferromagnetically
We have investigated the microscopic magnetic nature of BaVSe3 at ambient and high pressures with μ+SR using a powder sample
Summary
In the quasi-one-dimensional (Q1D) triangular compounds, in which the 1D ferromagnetic (FM) interaction along the c axis is stronger than the two-dimensional (2D) FM and/or antiferromagnetic (AF) interactions in the ab plane, the magnetic ground state is naturally determined by the competition between the 2D-FM and 2D-AF interactions. Geometrical frustration provides further complexity in determining the magnetic ground state [1]. To study the magnetic nature of the Q1D-2DTL system, a positive muon spin rotation and relaxation (μ+SR) experiment was initiated, since μ+SR is one of the most powerful tools for studying internal magnetic fields in solids at both ambient and high pressures due to its unique spatial and time resolutions [2,3]. TN is almost constant as the pressure (p) increases from ambient pressure to 1.4 GPa, TN decreases rapidly for p > 1.4 GPa, and disappears at p ∼ 1.8 GPa [4], above which a metallic phase is stabilized, combining the pressure dependence of TMI [12,13,14,15], TN is found to coincide with TMI at p > 1.4 GPa [4]
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.