de Haas-van Alphen oscillations in the underdoped high-temperature superconductor YBa2Cu3O6.5 |
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| Authors: | Jaudet Cyril Vignolles David Audouard Alain Levallois Julien LeBoeuf D Doiron-Leyraud Nicolas Vignolle B Nardone M Zitouni A Liang Ruixing Bonn D A Hardy W N Taillefer Louis Proust Cyril |
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| Institution: | Laboratoire National des Champs Magnétiques Pulsés (CNRS-UPS-INSA), Toulouse, France. |
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| Abstract: | The de Haas-van Alphen effect was observed in the underdoped cuprate YBa2Cu3O6.5 via a torque technique in pulsed magnetic fields up to 59 T. Above a field of approximately 30 T the magnetization exhibits clear quantum oscillations with a single frequency of 540 T and a cyclotron mass of 1.76 times the free electron mass, in excellent agreement with previously observed Shubnikov-de Haas oscillations. The oscillations obey the standard Lifshitz-Kosevich formula of Fermi-liquid theory. This thermodynamic observation of quantum oscillations confirms the existence of a well-defined, closed, and coherent, Fermi surface in the pseudogap phase of cuprates. |
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