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C. Jaudet1, D. Vignolles1, B. Vignolle1, A. Audouard1 , C. Proust1
A. Carrington2, A.P. Mackenzie3, N.E. Hussey2 R. Liang4,6, D.A. Bonn4,6, W.N. Hardy4,6, L. Taillefer5,6 1Laboratoire National des Champs Magnétiques Pulsés (LNCMP), UMR CNRS-UPS-INSA 5147, Toulouse 31400 France 2H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, U.K. 3School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife, KY169SS, U.K. 4Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada 5Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, Canada 6Canadian Institute for Advanced Research, Toronto, Canada We report de Haas-van Alphen (dHvA) measurement in underdoped YBa2Cu3O6.5 [1] and overdoped Tl2Ba2CuO6+δ [2] cuprates via a torque technique down to low temperature (0.7K) and up to high magnetic field (59T). dHvA oscillations are a thermodynamic signature of a close and coherent Fermi surface (FS). Fits to the standard Lifshitz-Kosevich theory allows the frequency (proportional to the area of the FS), the cyclotron mass and the scattering rate to be extracted. Our measurements show a drastic change in the FS topology from small pocket at low doping to large cylinder in the overdoped regime. [1]:C. Jaudet et al., Phys. Rev. Lett. 100, 187005(2008) [2]:B. Vignolle et al., Nature (2008) |
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