Critical Exponents in the Frustrated Heisenberg Antiferromagnet with Layered-Triangular Lattice: VBr₂

Abstract

Strong divergence of the magnetic heat capacity with the critical exponents α=0.59±0.05 and α'=0.28±0.05 has been found in the isotropic Heisenberg spin system with layered triangular lattice, VBr 2 , which gives an experimental support to the proposal of a new universality class of the critical exponents for frustrated systems.