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arXiv 0712.0926cond-mat.str-el
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Shastry-Sutherland系统SrCu $_2$(BO $_3$)$_2$量子基态的场依赖性

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

F. Levy, I. Sheikin, C. Berthier, M. Horvatic, M. Takigawa, H. Kageyama, T. Waki, Y. Ueda

摘要:

我们提出的Shastry-Sutherland量子自旋系统SrCu $_2$(BO $_3$)$_2$在磁场高达31 T和温度下降到50 mK的磁矩测量。一个新的量子相位观察到在1 T的字段范围以上的1/8平台,与最近的NMR结果。由于DM耦合的存在排除了真正的玻色-爱因斯坦凝聚的存在和超固相在SrCu $_2$(BO $_3$)$_2$中的形成,在平台附近的新相的确切性质仍有待解释。磁化和扭矩数据之间的比较揭示了一个巨大的贡献的Dzyaloshinskiii-Moriya相互作用的扭矩响应。最后,我们的测量结果表明,在脉冲场实验中,由于绝热磁热效应,存在一个过冷。

英文摘要:

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.

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