Magnetic structure investigation of the intercalated transition metal dichalcogenide V1/3NbS2

Abstract

We investigate the temperature evolution of the magnetic structure of V 1/3 NbS 2 using neutron diffraction techniques. We find that V 1/3 NbS 2 has two propagation vectors: k 0 = (0, 0, 0) and k 1 = (0, 0, 1 3 ). The k 0 vector can be associated with an antiferromagnetic ordering of in-plane moments with a refined value of 0.90(5)μ B , and k 1 can be associated with moments along the c axis in an up-down-down configuration with refined values of 1.21(12)μ B and 0.61(6)μ B . Both k 0 and k 1 magnetic components couple with an out-of-plane ferromagnetic moment consistent with magnetization data. Furthermore, single-crystal neutron diffraction shows evidence of diffuse magnetic scattering between the ( 010) and (01± 13 ) Bragg peaks. We also characterize the field and temperature evolution of the magnetic structure in V 1/3 NbS 2 by magnetic susceptibility and heat capacity measurements. The dc susceptibility measurements give an antiferromagnetic transition temperature of T N = 50 K, and the field scans reveal that the moment does not saturate at magnetic fields up to 100 kOe.

Comparative study of the structural and magnetic properties of Mn1/3NbS2 and Cr1/Hall1, Loudon2, Midgley3 et al. 2022Phys. Rev. MaterialsSelf Cite14180View full textAdd to dashboardCite

“…A reconstruction of the Ewald sphere for this data set can be seen in the Supplemental Material [35]. Refinement of the known model to the aristotype peak set, i.e., the idealized high symmetry version of the low symmetry structure, yields a phase with disorder over the main site [0.851 (15)], site i [0.079 (15)], and site ii [0.020 (15)], and potentially greater inversion twinning with a Flack parameter of 0.57 (10). Despite this inaccuracy, Table I reports the statistical fits of the aristotypical model to both data sets, along with the lattice and Flack parameters, atomic positions, and site occupancies for the purpose of discussion.…”

“…These intercalated TMDCs can be represented by the formula M 1/3 XY 2 , where X = Nb, Ta; Y = S, Se; and M is the intercalated transition metal. Depending on the type of transition metal used as the intercalant, the final compound can display many different types of magnetism [8,10]. The crystal structures of these materials are highly dependent on the level of intercalant, with the pristine XY 2 compound forming in the centrosymmetric P6 3 /mmc space group and transforming to the noncentrosymmetric space group P6 3 22 above a critical concentration of the intercalant, which occurs at M 1/3 XY 2 .…”

Chemical Trends of the Bulk and Surface Termination-Dependent Electronic Structure of Metal-Intercalated Transition Metal Dichalcogenides

“…Transition metal dichalcogenides (TMDs) have become the subject of intensive research, owing to the diverse properties they host. − These include metallic and insulating electronic structures, several notable examples of spin-valley locking, − collective phenomena such as charge density waves and superconducting states, − and a myriad of topological phases. − Intercalating magnetic transition metal ions into the van der Waals gap of 2H-TMDs has emerged as a powerful method to further stabilize novel magnetic states and textures, where the intercalant species nominally act as local magnetic moments. , At critical concentrations, they occupy periodic sites that break the centrosymmetry of the host compounds. This allows for the presence of antisymmetric Dzyaloshinskii–Moriya exchange interactions, which underpin the formation of a host of noncollinear magnetic orders. − …”

Highly tunable magnetic phases in transition metal dichalcogenide Fe$_{1/3+δ}$NbS$_2$

“…In the intercalated variant M 1/3 NbS 2 subgroup, chiral helimagnetism was observed for the Cr and Mn species [26][27][28][29][30]33]; the V and Co compounds exhibit a spin structure characterized by ferromagnetic planes stacked antiferromagnetically with canted in-plane moments [31,32,34]. Novel physical properties were reported in these species, including the anomalous Hall effect, an electrical magnetochiral effect and magnetic soliton confinement [35][36][37].…”