Unusual Oscillation in Tunneling Magnetoresistance near a Quantum Critical Point in Sr${}_3$Ru${}_2$O${}_7$

Abstract

We performed single electron tunneling measurements on bilayer ruthenate Sr${}_3$Ru${}_2$O${}_7$. We observe an unusual oscillation in tunneling magnetoresistance near the metamagnetic quantum phase transition at temperatures below 7 K. The characteristic features of this oscillation suggest that it is unrelated to traditional quantum oscillations caused by orbit quantization. In addition, tunneling spectra are found to change sharply in the low bias voltage range of $V$ $<$ 2mV near the transition field. These observations reveal that the Fermi surface of Sr${}_3$Ru${}_2$O${}_7$ changes in a surprising way as the system undergoes strong critical fluctuations.

arXiv commentTo appear in Physical Review Letters

References in corpus (7)

• Locally critical quantum phase transitions in strongly correlated metals
• Metamagnetism and critical fluctuations in high quality single crystals of the bilayer ruthenate Sr3Ru2O7
• The ground state of Sr3Ru2O7 revisited; Fermi liquid close to a ferromagnetic instability
• Metamagnetic Quantum Criticality
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• Multiple first-order metamagnetic transitions and quantum oscillations in ultrapure
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Cited by in corpus (5)

• Local Tunneling Spectroscopy across a Metamagnetic Critical Point in the Bi-layer Ruthenate Sr3Ru2O7
• Magnetic domain formation in itinerant metamagnets
• Itinerant ferromagnetism with finite ranged interactions
• Doping and dimensionality effects on the core-level spectra of layered ruthenates
• Spontaneous interlayer coherence in bilayer Kondo systems