Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.26: Poster
Mittwoch, 24. März 2010, 14:00–18:00, Poster D1
Shubnikov-de Haas oscillations in Ca3Ru2O7 under pressure — •Lina Klintberg1, Swee Goh1, Naoki Kikugawa2,3, Andrew Mackenzie2, Michael Sutherland1, and Malte Grosche1 — 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom — 2School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, United Kingdom — 3National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
The bilayer ruthenate Ca3Ru2O7 undergoes a series of phase transitions on cooling, which lead to a low carrier density state at low temperature. Hydrostatic pressure is applied on this material in order to track the Fermi surface whilst tuning and ultimately suppressing the high temperature phase transitions. Quantum oscillations in the Hall component of Ca3Ru2O7 are investigated as a function pressure using a piston-cylinder cell. As the pressure is increased, the oscillation frequency decreases systematically, suggesting that the Fermi pockets shrink. Owing to the size of the frequencies and to the non-linear background, the evolution of the effective masses cannot be determined accurately enough to extract a trend other than that they remain of the order of 0.6me. Further work at higher pressures is under way, using anvil cells, to track the evolution of the Fermi surface through the pressures where the magnetic and structural transitions eventually are suppressed.