Weak ferromagnetism of quasi-one-dimensional S=1/2 antiferromagnet BaCu$_2$Ge$_2$O$_7$

Details Weak ferromagnetism of quasi-one-dimensional S=1/2 antiferromagnet BaCu$_2$Ge$_2$O$_7$ Weak ferromagnetism of quasi-one-dimensional S=1/2 antiferromagnet BaCu$_2$Ge$_2$O$_7$

2000-04-25

arxiv.org/abs/cond-mat/0004403v2

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures

Scientific paper

10.1103/PhysRevB.62.R6061

Weak ferromagnetism of quasi-one-dimensional S = 1/2 antiferromagnet BaCu$_2$Ge$_2$O$_7$ is studied by the magnetization measurement. The spontaneous magnetization appears along the b axis. The local symmetry between the in-chain nearest neighbor spins allows the presence of Dzyaloshinskii-Moriya interaction, and the only possible spatial configuration of the weak ferromagnetic moment per spin determines the sign of the inter-chain interaction. A weak $a$-axis magnetic field can change the direction of the magnetization to the $a$-axis direction, which shows that the spin chain forms a weakly coupled weak-ferromagnetic chain system.

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