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X-band ESR measurements on a single crystal of SrCu$_2$(BO$_3$)$_2$ system ina temperature range between 10 K and 580 K are presented. The temperature andangular dependence of unusually broad ESR spectra can be explained by theinclusion of antisymmetric Dzyaloshinsky-Moriya (DM) interaction, which yieldsby far the largest contribution to the linewidth. However, the well-acceptedpicture of only out-of-plane interdimer DM vectors is not sufficient forexplanation of the observed angular dependence. In order to account for theexperimental linewidth anisotropy we had to include sizable in-plane componentsof interdimer as well as intradimer DM interaction in addition to theout-of-plane interdimer one. The nearest-neighbor DM vectors lie perpendicularto crystal anisotropy c-axis due to crystal symmetry. We also emphasize thatabove the structural phase transition occurring at 395 K dynamical mechanismshould be present allowing for instantaneous DM interactions. Moreover, thelinewidth at an arbitrary temperature can be divided into two contributions;namely, the first part arising from spin dynamics governed by the spinHamiltonian of the system and the second part due to significant spin-phononcoupling. The nature of the latter mechanism is attributed to phonon-modulationof the antisymmetric interaction, which is responsible for the observed linearincrease of the linewidth at high temperatures.Comment: 17 pages, 4 figures, submitted to PR

physical review. b, condensed matter and materials physics

X-band ESR determination of Dzyaloshinsky-Moriya interaction in the two-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">SrCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">BO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo…

X-band ESR determination of Dzyaloshinsky-Moriya interaction in the two-dimensionalSrCu2(BO3