Unusual quantum phase in exactly solvable doubly decorated Ising-Heisenberg models

TL;DR

This paper investigates ground-state properties of a spin-1/2 and spin-1 Ising-Heisenberg model on doubly decorated lattices, revealing unusual quantum phases caused by competing interactions and analyzing the influence of crystal fields.

Contribution

It introduces the existence of unusual quantum phases in exactly solvable models due to competing Ising and XXZ Heisenberg interactions, with detailed analysis of crystal field effects.

Findings

Identification of unusual quantum phases

Effect of crystal field on phase boundaries

Ground-state properties characterized

Abstract

Ground-state properties of the spin-1/2 and spin-1 Ising-Heisenberg model on doubly decorated planar lattices, are investigated in detail. On the basis of the mapping transformation method, we prove an existence of unusual quantum phases which occur due to the competition between Ising-type and XXZ anizotropic Heisenberg-type interactions. Effect of the crystal field on the ground-state phase boundaries has been also examined in detail.