Work

Ising Transition in the Two-Dimensional Quantum J1−J2 Heisenberg Model

Year: 2004

Type: article

Abstract: We study the thermodynamics of the spin-S two-dimensional quantum Heisenberg antiferromagnet on the square lattice with nearest (J1) and next-nearest (J2) neighbor couplings in its collinear phase (J(2)/J(1)>0.5), using the pure-quantum self-consistent harmonic approximation. Our results show the persistence of a finite-temperature Ising phase transition for every value of the spin, provided that the ratio J(2)/J(1) is greater than a critical value corresponding to the onset of collinear long-range order at zero temperature. We also calculate the spin and temperature dependence of the collinear susceptibility and correlation length, and we discuss our results in light of the experiments on Li2VOSiO4 and related compounds.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.92.157202

Authors: Luca Capriotti, Andrea Fubini, Tommaso Roscilde, Valerio Tognetti

Institutions: University of California, Santa Barbara, Kavli Institute for Theoretical Physics, University of Florence, University of Southern California, Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

Language: Latvian

Topic: Advanced Condensed Matter Physics

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W2000795215

FWCI: 2.957

Cites: 23

Cited by: 51

Related to: 10