Evolution of magnetism in the magnetic topological semimetal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>NdS</mml:mi><mml:msub><mml:mi mathvariant="normal">b</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">T</mml:mi><mml:msub><mml:mi mathvariant="normal">e</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Santosh Karki Chhetri, Rabindra Basnet, Jian Wang, K. C. Pandey, Gokul Acharya, Md Rafique Un Nabi, Dinesh Upreti, Josh Sakon, Mansour Mortazavi, Jin Hu
Abstract
Magnetic topological semimetals LnSbTe ($Ln=\mathrm{lanthanide}$) have attracted intensive attention because of the presence of interplay between magnetism, topological, and electron correlations depending on the choices of magnetic Ln elements. Recently, varying Sb-Te composition has been found to effectively control the electronic and magnetic states in $Ln\mathrm{S}{\mathrm{b}}_{x}\mathrm{T}{\mathrm{e}}_{2\ensuremath{-}x}$. With this motivation, we report the evolution of magnetic properties with Sb-Te substitution in $\mathrm{NdS}{\mathrm{b}}_{x}\mathrm{T}{\mathrm{e}}_{2\ensuremath{-}x+\ensuremath{\delta}}$, $(0\ensuremath{\le}x\ensuremath{\le}1)$. Our work reveals the interesting nonmonotonic change in magnetic ordering temperature with varying composition stoichiometry. In addition, reducing the Sb content $x$ drives the reorientation of moments from in-plane ($ab$-plane) to out-of-plane ($c$-axis) direction that results in the distinct magnetic structures for two end compounds $\mathrm{NdT}{\mathrm{e}}_{2}$ $(x=0)$ and NdSbTe $(x=1)$. Furthermore, the moment orientation in $\mathrm{NdS}{\mathrm{b}}_{x}\mathrm{T}{\mathrm{e}}_{2\ensuremath{-}x+\ensuremath{\delta}}$ is also found to be strongly tunable upon application of a weak magnetic field, leading to rich magnetic phases depending on the composition stoichiometry, temperature, and magnetic field. Such strong tuning of magnetism in this material establishes it as a promising platform for investigating tunable topological states and correlated topological physics.