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Quantum critical metamagnetism of Sr3Ru2O7 under hydrostatic pressure

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Citation

Wu, W., McCollam, A., Grigera, S. A., Perry, R. S., Mackenzie, A. P., & Julian, S. R. (2011). Quantum critical metamagnetism of Sr3Ru2O7 under hydrostatic pressure. Physical Review B, 83(4): 045106, pp. 1-7. doi:10.1103/PhysRevB.83.045106.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-F294-7
Abstract
Using ac susceptibility, we have determined the pressure dependence of the metamagnetic critical endpoint temperature T* for a field applied in the ab plane in the itinerant metamagnet Sr3Ru2O7. We find that T* falls monotonically to zero as pressure increases, producing a quantum critical endpoint (QCEP) at P-c similar to 13.6 +/- 0.2 kbar. New features are observed near the QCEP-the slope of T* versus pressure changes at similar to 12.8 kbar, and weak subsidiary maxima appear on either side of the main susceptibility peak at pressures near P-c-indicating that some new physics comes into play near the QCEP. Clear signatures of a nematic phase, however, that were seen in field-angle tuning of T* are not observed. As T* is suppressed by pressure, the metamagnetic peak in the susceptibility remains sharp as a function of an applied magnetic field. As a function of temperature, however, the peak becomes broad with only a very weak maximum, suggesting that, near the QCEP, the uniform magnetization density is not the order parameter for the metamagnetic transition.