期刊
PHYSICAL REVIEW B
卷 92, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.134417
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资金
- Russian Foundation for Basic Research [15-02-05918]
- Program for Basic Research of the Presidium of Russian Academy of Sciences
- Swiss National Science Foundation, Division 2
The electron spin resonance spectrum of a quasi-1D S = 1/2 antiferromagnet K2CuSO4Br2 was found to demonstrate an energy gap and a doublet of resonance lines in a wide temperature range between the Curie-Weiss and Neel temperatures. This type of magnetic resonance absorption corresponds well to the two-spinon continuum of excitations in S = 1/2 antiferromagnetic spin chainwith a uniform Dzyaloshinskii-Moriya interaction between the magnetic ions. A resonance mode of paramagnetic defects demonstrating strongly anisotropic behavior due to interaction with spinon excitations in the main matrix is also observed.
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