  Low-dimensional metal complexes are versatile materials with tunable physical
and chemical properties that make these systems promising platforms for caloric
applications. In this context, this work proposes a quantum Stirling cycle
based on a dinuclear metal complex as a working substance. The results show
that the quantum cycle operational modes can be managed when considering the
change in the magnetic coupling of the material and the temperature of the
reservoirs. Moreover, magnetic susceptibility can be used to characterize the
heat exchanges of each cycle step and, therefore, its performance. As a proof
of concept, the efficiency of the heat engine is obtained from experimental
susceptibility data. These results open doors for studying quantum
thermodynamic cycles by using metal complexes; and further the development of
emerging quantum technologies based on these advanced materials.

Quantum Physics