Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Neutron Scattering Study of Magnetic Anisotropy in the Tetragonal Antiferromagnet Bi2CuO4

Published

Author(s)

Bo Yuan, Nicholas Butch, Guangyong Xu, Barry Winn, J. P. Clancy, Young-June Kim

Abstract

We report neutron scattering study of low energy magnetic excitations in S =1/2 quantum magnet Bi2CuO4 with a tetragonal lattice structure. Our observation of a spin flop transition at a small field of 0.4 Tesla indicates the existence of a small anisotropy within the easy plane. Since any magnetic anisotropy is forbidden by symmetry within the easy-plane on a classical level and the simple lattice structure of Bi2CuO4 rules out any other types of in-plane anisotropy found in other cuprates, the observed anisotropy is attributed to a pure quantum effect. Our calculation of magnon quantum zero point fluctuation shows this quantitatively. The model spin Hamiltonian used for the calculation, incorporation Dzyaloshinskii-Moriya and symmetric anisotropic interactions, is determined independently from the experimental dispersion of the out-of-plane mode. Our results clearly demonstrates that Bi2CuO4 is a textbook example of anisotropy generated by quantum fluctuation.
Citation
Physical Review B
Volume
103
Issue
13

Keywords

quantum magnet, spin fluctuation, inelastic neutron scattering

Citation

Yuan, B. , Butch, N. , Xu, G. , Winn, B. , Clancy, J. and Kim, Y. (2021), Neutron Scattering Study of Magnetic Anisotropy in the Tetragonal Antiferromagnet Bi<sub>2</sub>CuO<sub>4</sub>, Physical Review B (Accessed August 10, 2022)
Created April 25, 2021, Updated October 1, 2021