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Electron Spin Resonance of SrCu2(BO3)2 at High Magnetic Field

S. El Shawish·J. Bonca·C. D. Batista·I. sega
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Abstract

We calculate the electron spin resonance (ESR) spectra of the quasi-two-dimensional dimer spin liquid SrCu2(BO3)2 as a function of magnetic field B. Using the standard Lanczos method, we solve a Shastry-Sutherland Hamiltonian with additional Dzyaloshinsky-Moriya (DM) terms which are crucial to explain different qualitative aspects of the ESR spectra. In particular, a nearest-neighbor DM interaction with a non-zero D_z component is required to explain the low frequency ESR lines for B || c. This suggests that crystal symmetry is lowered at low temperatures due to a structural phase transition.

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S. El Shawish, J. Bonca, C. D. Batista, I. sega. 2004-07-23. Electron Spin Resonance of SrCu2(BO3)2 at High Magnetic Field. https://doi.org/10.1103/physrevb.71.014413

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