Wu, W; McCollam, A; Grigera, SA; Perry, RS; Mackenzie, AP; Julian, SR; (2011) Quantum critical metamagnetism of Sr3Ru2O7 under hydrostatic pressure. Physical Review B , 83 (4) , Article 045106. 10.1103/PhysRevB.83.045106.

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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 Pc ∼ 13.6 ± 0.2 kbar. New features are observed near the QCEP—the slope of T ∗ versus pressure changes at ∼12.8 kbar, and weak subsidiary maxima appear on either side of the main susceptibility peak at pressures near Pc—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.

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