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The Shastry-Sutherland compound SrCu$_2$(BO$_3$)$_2$ constitutingorthogonally coupled dimers harbors a $S=0$ singlet ground state. Theconfluence of strong interdimer interaction and frustration engenders aspectrum of low-energy excitations including localized triplons as well assinglet and triplet bound states. Their dynamics are controlled by an externalmagnetic field and temperature. Here, we employ high-field Raman spectroscopyto map the field and temperature evolution of such bosonic compositequasiparticles on approaching the 1/8 magnetization plateau. Our study unveilsthat the magnetic field and thermal fluctuations show remarkably similareffects in melting the singlet bound states, but are disparate in their effectson the fine spectral shapes. This, together with the anti-crossing of twosinglet bound states in the intermediate field $B=10-16$ T, is discussed interms of the correlated dynamics of frustrated, interacting bosons.

Thermally populated versus field-induced triplon bound states in the Shastry-Sutherland lattice SrCu$_2$(BO$_3$)$_2$