Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.226402
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Funding
- EPSRC [EP/G007357/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G007357/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [15K13521] Funding Source: KAKEN
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Bilayer strontium ruthenate Sr3Ru2O7 displays pronounced non-Fermi liquid behavior at magnetic fields around 8 T, applied perpendicular to the ruthenate planes, which previously has been associated with an itinerant metamagnetic quantum critical end point (QCEP). We focus on the magnetic Gruneisen parameter Gamma(H), which is the most direct probe to characterize field-induced quantum criticality. We confirm quantum critical scaling due to a putative two-dimensional QCEP near 7.845(5) T, which is masked by two ordered phases A and B, identified previously by neutron scattering. In addition, we find evidence for a QCEP at 7.53 (2) T and determine the quantum critical regimes of both instabilities and the effect of their superposition.
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