Synthesis and pressure and field dependent magnetic properties of the Kagome-bilayer spin liquid Ca$_{10}$Cr$_7$O$_{28}$

TL;DR

This study synthesizes Ca$_{10}$Cr$_7$O$_{28}$, a spin liquid material, and investigates its magnetic properties under various pressures and magnetic fields, revealing robust spin-liquid behavior despite ferromagnetic interactions.

Contribution

It provides the first detailed measurements of pressure-dependent magnetic susceptibility and heat capacity of Ca$_{10}$Cr$_7$O$_{28}$, demonstrating the stability of its spin-liquid state.

Findings

Presence of both ferromagnetic and antiferromagnetic interactions

Spin-liquid state persists under pressures up to 1 GPa

Broad heat capacity anomaly at 2.5 K shifting with magnetic field

Abstract

We report synthesis of polycrystalline samples of the recently discovered spin liquid material Ca$_{10}$Cr$_7$O$_{28}$ and present measurements of the ambient and high pressure magnetic susceptibility $\chi$ versus temperature $T$, magnetization $M$ versus magnetic field $H$ at various $T$, and heat capacity $C$ versus $T$ at various $H$. The ambient pressure magnetic measurements indicate the presence of both ferromagnetic and antiferromagnetic exchange interactions with dominant ferromagnetic interactions and with the largest magnetic energy scale $\sim 10$~K\@. The $\chi(T)$ measurements under externally applied pressure of up to $P \approx 1$~GPa indicate the robust nature of the spin-liquid state despite relative increase in the ferromagnetic exchanges. $C(T)$ shows a broad anomaly at $T\approx 2.5$~K which moves to higher temperatures in a magnetic field. The evolution of the low temperature $C(T,H)$ and the magnetic entropy is consistent with frustrated magnetism in Ca$_{10}$Cr$_7$O$_{28}$.