Field dependence of the quantum ground state in the Shastry-Sutherland system SrCu$_2$(BO$_3$)$_2$
| Autor: | Levy, F., Sheikin, I., Berthier, C., Horvatic, M., Takigawa, M., Kageyama, H., Waki, T., Ueda, Y. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Europhysics Letters (EPL) 81 (2008) 67004 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/81/67004 |
| Popis: | 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. Comment: submitted to European Physical Letters |
| Databáze: | arXiv |
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