Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-06-18
Physics
Condensed Matter
Strongly Correlated Electrons
To appear in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.92.257206
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.
Hooper Joe
Maeno Yoshiteru
Mao Zhiqiang
Perry Robin
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