Multiple Metamagnetic Quantum Criticality in Sr_{3}Ru_{2}O_{7}.
Bilayer strontium ruthenate Sr_{3}Ru_{2}O_{7} 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 Grüneisen parameter Γ_{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.
I. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.|Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
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Tokiwa
I. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.
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Mchalwat
London Centre for Nanotechnology, Faculty of Maths & Physical Sciences, University College London, London-WC1E 6BT, United Kingdom.
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Perry
I. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.|Experimentalphysik VI, Center for Electronic Correlations and Magnetism, Augsburg University, 86159 Augsburg, Germany.
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Gegenwart