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

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

2004-07-23

arxiv.org/abs/cond-mat/0407632v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 b&w figures

Scientific paper

10.1103/PhysRevB.71.014413

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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