%D 2011
%N 4
%T Quantum critical metamagnetism of Sr3Ru2O7 under hydrostatic pressure
%A W Wu
%A A McCollam
%A SA Grigera
%A RS Perry
%A AP Mackenzie
%A SR Julian
%V 83
%O This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
%X 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.
%J Physical Review B
%L discovery10134056
%I AMER PHYSICAL SOC