in High Magnetic Fields to 45T*

SrCu₂(BO₃)₂ is a quasi-two dimensional orthogonal spin dimer system with a spin singlet ground state. It is a realization of the Shastry Sutherland model, and exhibits a sequence of magnetization plateaux at magnetic fields in excess of 20 T, i.e. high enough to close the low temperature spin gap [1]. The unique behavior of this quantum spin liquid results from the interplay between geometrical frustration and strong quantum fluctuations. We will discuss the origin and characteristics of the strong spin-lattice coupling in SrCu₂(BO₃)₂, as learned from experimetal studies of Raman scattering, thermal expansion, and magnetostriction performed in high DC magnetic fields to 45T. The interpretation of experimental results is supported by a theoretical analysis and prediction of active Raman modes that include the so-called panthograph mode [2].
[1] M. Jaime, et al. Proc. Natl. Acad. Sci. 109, 12407 (2012).
[2] G. Radtke et al., Proc. Natl. Acad. Sci. 112, 1971 (2015).