Negative-chirality order in $S=1/2$ kagome antiferromagnet CdCu$_{3}$(OH)$_{6}$(NO$_{3}$)$_{2}\cdot $H$_{2}$O

TL;DR

This study reveals a negative vector chirality magnetic order in the $S=1/2$ kagome antiferromagnet CdCu$_{3}$(OH)$_{6}$(NO$_{3}$)$_{2}ullet$H$_{2}$O, using neutron diffraction and NMR to analyze its microscopic magnetic structure below 4 K.

Contribution

The paper identifies a chirality-ordered magnetic structure with negative vector chirality in a kagome antiferromagnet, combining neutron diffraction and NMR techniques for microscopic analysis.

Findings

Magnetic Bragg reflections indicate a $q=0$ magnetic structure below 4 K.

NMR measurements confirm the internal field direction consistent with negative vector chirality.

The magnetic structure exhibits $oldsymbol{ extless} 100 oldsymbol{ extgreater}$ anisotropy.

Abstract

The neutron diffraction and nuclear magnetic resonance (NMR) measurements have been used to microscopically analyze the magnetic structure in the $S = 1/2$ kagome antiferromagnet CdCu$_{3}$(OH)$_{6}$(NO$_{3}$)$_{2}\cdot $H$_{2}$O. Below the magnetic ordering temperature $T_N\simeq 4$ K, magnetic Bragg reflections at (110) and (100) were found in the neutron diffraction pattern, which suggests a $q=0$ magnetic structure. Furthermore, the vector spin chirality for the $q=0$ structure was successfully identified from the internal field direction obtained by the $^{14}$N-NMR measurement. Our findings point to a chirality-ordered magnetic structure with negative vector chirality and $\langle 100 \rangle$ anisotropy.