The Ising model remains a cornerstone in the study of statistical mechanics, providing a simple yet profound framework for understanding cooperative phenomena and criticality in physical systems. By ...

By extending a proof of a physically important behavior in one-dimensional quantum spin systems to higher dimensions, a RIKEN physicist has shown in a new study that the model lacks exact solutions.

A two-dimensional representation of a ten-dimensional hypercube. A RIKEN researcher has shown that quantum Ising models lack ...

We report results of low-temperature heat-capacity, magnetocaloric-effect, and neutron-diffraction measurements of TmVO₄, an insulator that undergoes a continuous ferroquadrupolar phase transition ...