Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-12-06
Europhysics Letters (EPL) 81 (2008) 67004
Physics
Condensed Matter
Strongly Correlated Electrons
submitted to European Physical Letters
Scientific paper
10.1209/0295-5075/81/67004
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.
Berthier Claude
Horvatic Mladen
Kageyama Hiroshi
Levy Francis
Sheikin Ilya
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