Experimental benchmark of the quantum-classical crossover in a spin ladder
Phys. Rev. B 112, 224419 – Published 10 December, 2025
DOI: https://doi.org/10.1103/zkn9-5n6n
Abstract
We report a spin- three-leg ladder realized in a radical-Mn polymer, exhibiting an antiferromagnetic transition and magnetization curves accurately described by classical mean-field theory. Although the underlying spin model intrinsically supports strong quantum fluctuations, as confirmed by quantum Monte Carlo simulations, the real system shows an anomalously complete suppression of quantum behavior. These findings provide a key experimental benchmark for the quantum-classical crossover and suggest that lattice topology can play a crucial role in tuning the balance between quantum and classical physics in strongly correlated systems.
