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要旨:
We study the relationship between the nematic phases of Sr3Ru2O7 and
quantum criticality. At ambient pressure, one nematic phase is
associated with a metamagnetic quantum critical end point (QCEP) when
the applied magnetic field is near the c axis. We show, however, that
this metamagnetic transition does not produce the same nematic
signatures when the QCEP is reached by hydrostatic pressure with the
field applied in the ab plane. Moreover, a second nematic phase, that is
seen for field applied in the ab plane close to, but not right at, a
second metamagnetic anomaly, persists with minimal change to the highest
applied pressure, 16.55 kbar. Taken together our results suggest that
metamagnetic quantum criticality may not be necessary for the formation
of a nematic phase in Sr3Ru2O7.
