Scalar Chiral Spin-1/2 Order on Kagome Lattices in Nd3Sb3Mg2O14

TL;DR

This paper reports the discovery of scalar chiral spin-1/2 magnetic order in Nd3Sb3Mg2O14, a kagome lattice compound, characterized by neutron scattering and thermodynamic measurements, revealing a non-coplanar magnetic structure with a phase transition at 0.56 K.

Contribution

The study introduces Nd3Sb3Mg2O14 as a new kagome lattice material exhibiting scalar chiral magnetic order with detailed experimental characterization.

Findings

Neutron scattering shows non-coplanar scalar chiral ${f k} =0$ magnetic order.

A second order phase transition occurs at 0.56 K.

Ordered magnetic moment is approximately 1.79 μ_B.

Abstract

We introduce $\mathrm{Nd_{3}Sb_{3}Mg_{2}O_{14}}$ with ideal kagome lattices of neodymium ions in ABC stacking. Thermodynamic measurements show a Curie-Weiss temperature of $\Theta_{CW}=-0.12~$K, a Nd$^{3+}$ spin-1/2 Kramers doublet ground state, and a second order phase transition at $T_N=0.56(2)~$K. Neutron scattering reveals non-coplanar scalar chiral ${\bf k} =0$ magnetic order with a correlation length exceeding 400 \AA = 55 $a$ and an ordered moment of $1.79(5)~\mu_B$. This order includes a canted ferromagnetic component perpendicular to the kagome planes favored by Dzyaloshinskii-Moriya interactions.