Dynamical coupling of dilute magnetic impurities with quantum spin liquid state in the S = 3/2 dimer compound Ba3ZnRu2O9

TL;DR

This study explores how dilute magnetic impurities influence the magnetic properties of a quantum spin liquid candidate Ba3ZnRu2O9, revealing host-dependent impurity responses and contributions from Ru5+ ions.

Contribution

It provides new insights into impurity effects in quantum spin liquids and highlights the role of host material differences in magnetic responses.

Findings

Magnetic impurities behave as paramagnetic spins in both compounds.

The Weiss temperature varies depending on the host material.

Ru5+ ions contribute to magnetic responses in Ba3ZnRu2O9.

Abstract

We have investigated the dilute magnetic impurity effect on the magnetic properties of a quantum spin liquid candidate Ba3ZnRu2O9 and a spin gapped compound Ba3CaRu2O9. The magnetic ground state of each compound stands against 2% substitution of magnetic impurities for Zn or Ca. We have found that the magnetic response of these impurities, which behave as paramagnetic spins, depends on the host materials and the difference of the two manifests itself in the Weiss temperature, which can hardly be explained by the dilute magnetic impurities alone in the case of Ba3ZnRu2O9. We consider a contribution from the Ru5+ ions which would appear only in the substituted Ba3ZnRu2O9 and discuss a possible physical meaning of the observed Weiss temperature.