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  • Letter

Gapped ground state in a spin-12 frustrated square lattice

H. Yamaguchi1, N. Uemoto1, T. Okubo2, Y. Kono3, S. Kittaka3, T. Sakakibara4, T. Yajima4, S. Shimono5, Y. Iwasaki1 et al.

Y. Hosokoshi1

  • 1Department of Physical Science, Osaka Prefecture University, Osaka 599-8531, Japan
  • 2Department of Physics, the University of Tokyo, Tokyo 113-0033, Japan
  • 3Department of Physics, Chuo University, Tokyo 112-8551, Japan
  • 4Institute for Solid State Physics, the University of Tokyo, Chiba 277-8581, Japan
  • 5Department of Materials Science and Engineering, National Defense Academy, Kanagawa 239-8686, Japan

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Phys. Rev. B 104, L060411 – Published 27 August, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L060411

Abstract

We present a model compound with a spin-1/2 frustrated square lattice, in which three ferromagnetic (F) interactions and one antiferromagnetic (AF) compet. Considering the effective spin-1 formed by the dominant F dimer, this square lattice can be mapped to a spin-1 spatially anisotropic triangular lattice. The magnetization curve exhibits gapped behavior indicative of a dominant one-dimensional (1D) AF correlation. In the field-induced gapless phase, the specific heat and magnetic susceptibility show a phase transition to an ordered state with 2D characteristics. These results indicate that the spin-1 Haldane state is extended to the 2D system. We demonstrate that the gapped ground state observed in the present spin-1/2 frustrated square lattice originates from the one-dimensionalization caused by frustration.

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Phys. Rev. B 104, L060411– Published 27 August, 2021
  • Received 5 April 2021
  • Accepted 20 August 2021
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