Dzyaloshinski-Moriya Interaction in the 2D Spin Gap System <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>SrCu</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mo>(</mo><mrow><msub><mrow><mi>BO</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow><mrow><msub><mrow><mo>)</mo></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

O. Cépas; K. Kakurai; L. P. Regnault; T. Ziman; J. P. Boucher; N. Aso; M. Nishi; H. Kageyama; Y. Ueda

doi:10.1103/PhysRevLett.87.167205

Dzyaloshinski-Moriya Interaction in the 2D Spin Gap System ${SrCu}_{2} ({BO}_{3})_{2}$

O. Cépas, K. Kakurai, L. P. Regnault, T. Ziman, J. P. Boucher, N. Aso, M. Nishi, H. Kageyama, and Y. Ueda

Phys. Rev. Lett. 87, 167205 – Published 2 October 2001

Abstract

The Dzyaloshinski-Moriya interaction partially lifts the magnetic frustration of the spin- $1 / 2$ oxide ${SrCu}_{2} ({BO}_{3})_{2}$ . It explains the fine structure of the excited triplet state and its unusual magnetic field dependence, as observed in previous ESR and new neutron inelastic scattering experiments. We claim that it is mainly responsible for the dispersion. We propose also a new mechanism for the observed ESR transitions forbidden by standard selection rules, which relies on an instantaneous Dzyaloshinski-Moriya interaction induced by spin-phonon couplings.

Received 11 January 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.167205

Authors & Affiliations

O. Cépas¹, K. Kakurai², L. P. Regnault³, T. Ziman¹, J. P. Boucher⁴, N. Aso², M. Nishi², H. Kageyama⁵, and Y. Ueda⁵

¹Institut Laue Langevin, BP 156, F-38042 Grenoble Cedex 9, France
²Neutron Scattering Laboratory, ISSP, University of Tokyo, 106-1, Shirakata, Tokai, Ibaraki 319-1106, Japan
³DRFMC-SPSMS, Laboratoire de Magnétisme et de Diffraction Neutronique, CEA, F-38054 Grenoble Cedex 9, France
⁴Laboratoire de Spectrométrie Physique, Université J. Fourier, BP 87, F-38402 Saint Martin d'Hères Cedex, France
⁵Materials Design and Characterization Laboratory, IRSP, University of Tokyo, 5-1-5 Kashiwa, Chiba 277-8581, Japan