Magnetic excitation in a new spin gap compound Cu$_2$Sc$_2$Ge$_4$O$_{13}$: Comparison to Cu$_2$Fe$_2$Ge$_4$O$_{13}$

TL;DR

This study introduces a new spin gap compound, Cu$_2$Sc$_2$Ge$_4$O$_{13}$, demonstrating similar magnetic properties to Cu$_2$Fe$_2$Ge$_4$O$_{13}$ through susceptibility, heat capacity, and neutron scattering measurements.

Contribution

The paper reports the synthesis and characterization of a new spin gap compound with magnetic properties comparable to an existing compound, expanding understanding of weakly coupled spin chain and dimer systems.

Findings

The new compound exhibits a spin gap similar to Cu$_2$Fe$_2$Ge$_4$O$_{13}$.

Magnetic susceptibility and neutron scattering confirm the presence of spin dimers.

The energy scale of dimers in the Sc compound matches that in the Fe compound.

Abstract

The compound \CuScGeO is presented as a new member of the family of weakly coupled spin chain and dimer compounds \CuMGeO. Magnetic susceptibility, heat capacity, and neutron inelastic scattering measurements reveal that the compound has the same spin dimer component as \CuFeGeO. The observed narrow band excitation in bulk measurements is consistent with spin gap behavior. The energy scale of the weakly coupled dimers in the Sc compound is perfectly coincident with that in the Fe compound.