Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-01-20
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages 4 figures, submitted
Scientific paper
10.1103/PhysRevLett.92.166602
We present measurements on ultra clean single crystals of the bilayered ruthenate metal Sr3Ru2O7, which has a magnetic-field-tuned quantum critical point. Quantum oscillations of differing frequencies can be seen in the resistivity both below and above its metamagnetic transition. This frequency shift corresponds to a small change in the Fermi surface volume that is qualitatively consistent with the small moment change in the magnetisation across the metamagnetic transition. Very near the metamagnetic field, unusual behaviour is seen. There is a strong enhancement of the resistivity in a narrow field window, with a minimum in the resistivity as a function of temperature below 1 K that becomes more pronounced as the disorder level decreases. The region of anomalous behaviour is bounded at low temperatures by two first-order phase transitions. The implications of the results are discussed. PACS: 68.35.Rh, 71.27.+a, 72.15.-v, 74.70.Pq
Borzi Rodolfo A.
Grigera S. A.
Ishida Keiichi
Kitagawa Kentaro
Mackenzie Andrew Peter
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