期刊
PHYSICAL REVIEW LETTERS
卷 85, 期 4, 页码 832-835出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.832
关键词
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Inelastic neutron scattering measurements are reported that show a new longitudinal mode in the antiferromagnetically ordered phase of the spin-1/2 quasi-one-dimensional antiferromagnet KCuF3. This mode signals the crossover from one-dimensional to three-dimensional behavior and indicates a reduction in the ordered spin moment of a spin-1/2 antiferromagnet. The measurements an compared with recent quantum field theory calculations and are found to be in excellent agreement. A feature of the data not predicted by theory is a damping of the mode by decay processes to the transverse spin-wave branches.
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