“Narrower first-order transition region in J1-J2 Ising model and Ashkin-Teller universality class disagreement”

https://pubmed.ncbi.nlm.nih.gov/38115502

The J1-J2 Ising model on a square lattice undergoes a narrower first-order transition region than previously thought, and the Ashkin-Teller universality class region may not match the varying critical exponent region.