Field dependence of the quantum ground state in the Shastry-Sutherland system SrCu${}_2$(BO${}_3$)${}_2$

Abstract

We present magnetic torque measurements on the Shastry-Sutherland quantum spin system SrCu${}_2$(BO${}_3$)${}_2$ in fields up to 31 T and temperatures down to 50 mK. A new quantum phase is observed in a 1 T field range above the 1/8 plateau, in agreement with recent NMR results. Since the presence of the DM coupling precludes the existence of a true Bose-Einstein condensation and the formation of a supersolid phase in SrCu${}_2$(BO${}_3$)${}_2$, the exact nature of the new phase in the vicinity of the plateau remains to be explained. Comparison between magnetization and torque data reveals a huge contribution of the Dzyaloshinskii-Moriya interaction to the torque response. Finally, our measurements demonstrate the existence of a supercooling due to adiabatic magnetocaloric effects in pulsed field experiments.

submitted to European Physical Letters

References in corpus (7)

• Supersolid phase induced by correlated hopping in spin-1/2 frustrated quantum magnets
• Quantum and thermal transitions out of the supersolid phase of a 2D quantum antiferromagnet
• Supersolid phase in spin dimer XXZ systems under magnetic field
• Uniform and staggered magnetizations induced by Dzyaloshinskii-Moriya interactions in isolated and coupled spin 1/2 dimers in a magnetic field
• Magnetocaloric effect in two-dimensional spin-1/2 antiferromagnets
• NMR evidence for the persistence of spin-superlattice above the 1/8 magnetization plateau in SrCu2(BO3)2
• Ising phases of Heisenberg ladders in a magnetic field

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