Exploring Magnetocaloric Response in Low-Dimensional Spin Systems

Quantum criticality in low-dimensional spin systems remains central in modern condensed matter physics, offering fundamental insight into how strong quantum fluctuations govern macroscopic responses. In this presentation, we investigate how such strong fluctuations in the low-temperature quantum critical regime and field-induced phase transitions affect the magnetocaloric effect (MCE) of strongly correlated magnets. Through state-of-the-art many-body calculations of the spin-1 Heisenberg antiferromagnetic chain, we explore the interplay among temperature, magnetic field, and criticality that leads to enhanced entropy variations near quantum phase transitions and MCE properties in the high B/T regime. Building on these results, we extend our computational framework to the two-dimensional Shastry-Sutherland lattice, where multiple competing phases and field-induced quantum criticality have been proposed. This system provides a rich platform to further examine how quantum criticality and frustration gives rise to strong MCE properties.