Intrinsic susceptibility and bond defects in the novel 2D frustrated antiferromagnet Ba$_{2}$Sn$_{2}$ZnCr$_{7p}$Ga$_{10-7p}$O$_{22}$

TL;DR

This study investigates the magnetic properties of a highly frustrated 2D antiferromagnet, revealing intrinsic susceptibility behavior and bond defects, with implications for understanding magnetic frustration and disorder.

Contribution

It provides new insights into intrinsic susceptibility and bond defects in a novel 2D frustrated antiferromagnet, highlighting the role of bond disorder and magnetic dilution.

Findings

Intrinsic susceptibility peaks around 45 K.

Bond defects are independent of dilution.

Magnetic lattice dilution does not alter average susceptibility.

Abstract

We present microscopic and macroscopic magnetic properties of the highly frustrated antiferromagnet Ba$_{2}$Sn$_{2}$ZnCr$_{7p}$Ga$_{10-7p}$O$_{22}$, respectively probed with NMR and SQUID experiments. The $T$-variation of the intrinsic susceptibility of the Cr$^{3+}$ frustrated kagom\'{e} bilayer, $\chi_{kag}$, displays a maximum around 45 K. The dilution of the magnetic lattice has been studied in detail for $0.29 \leq p \leq0.97$. Novel dilution independent defects, likely related with magnetic bond disorder, are evidenced and discussed. We compare our results to SrCr$_{9p}$Ga$_{12-9p}$O$_{19}$. Both bond defects and spin vacancies do not affect the average susceptibility of the kagom\'{e} bilayers.