Quantum critical metamagnetism of Sr3Ru2O7 under hydrostatic pressure

W Wu, A. McCollam, Santiago Andres Grigera, Robin Stuart Perry, Andrew Mackenzie, S. R. Julian

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28 Citations (Scopus)

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.

Original languageEnglish
Article number045106
Number of pages7
JournalPhysical Review. B, Condensed matter and materials physics
Volume83
Issue number4
DOIs
Publication statusPublished - 25 Jan 2011

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