Quantum fluctuations in high field magnetization of 2D square lattice J1-J2 antiferromagnets

JP Carlo, YJ Uemura, T Goko, GJ MacDougall, JA Rodriguez, W Yu, GM Luke, P Dai, NSP Shannon, S Miyasaka, S Suzuki, S Tajima, GF Chen, WZ Hu, JL Luo, NL Wang

Research output: Contribution to journalArticle (Academic Journal)peer-review

28 Citations (Scopus)

Abstract

The J1-J2 square lattice Heisenberg model with spin S=1/2 has exchange bonds both along sides (J1) and along diagonals (J2) of the square. It exhibits three phases with long-range magnetic order and two unconventionally ordered phases depending on the ratio J2/J1 of exchange constants. It describes a number of recently found layered vanadium oxide compounds. A simple means of investigating the ground state is the study of the magnetization curve and high field susceptibility. We discuss these quantities by using the second-order spin-wave theory and the exact diagonalization in the whole J1-J2 plane. We compare both results and find good overall agreement in the sectors of the phase diagram with magnetic order. Close to the disordered regions, the magnetization curve shows strong deviations from the classical linear behavior caused by large quantum fluctuations, and the spin-wave approximation breaks down. On the ferromagnet side (J1
Translated title of the contributionQuantum fluctuations in high field magnetization of 2D square lattice J1-J2 antiferromagnets
Original languageEnglish
Pages (from-to)104441-1 - 104441-11
Number of pages11
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume77
DOIs
Publication statusPublished - Mar 2008

Bibliographical note

Publisher: The American Physical Society

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