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Electron spin resonance in a model S=1/2 chain antiferromagnet with a uniform Dzyaloshinskii-Moriya interaction

Physical Review B: Condensed Matter and Materials Physics. 2015. Vol. 92. P. 134417.
Smirnov A., Soldatov T. A., Povarov K. Y., Hälg M., Lorenz W. E., Zheludev A.

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 Neèl temperatures. This type of magnetic resonance absorption corresponds well to the two-spinon continuum of excitations in S=1/2 antiferromagnetic spin chain with 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.

 

 

Research target: Physics
Priority areas: engineering science
Language: English
Full text
DOI
Keywords: antiferromagnetismelectron spin resonanceантиферромагнетизмэлектронный спиновый резонанс
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