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Oscillations de Haas-van Alphen dans le cuprate sous-dopé YBa2Cu3O6.5

In pulsed magnetic fields at LNCMP in Toulouse, the de Haas-van Alphen effect was observed in the underdoped cuprate YBa 2 Cu 3 O 6.5 via a torque technique in pulsed magnetic fields up to 59 T. Above an irreversibility field of 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.



YBa2Cu3O6.5 sample (140*140*40 µm 3 ) glued to the cantilever beam

The oscillations obey the standard Lifshitz-Kosevich formula of Fermi-liquid theory. This thermodynamic observation of quantum oscillations confirms the existence of a welldefined, close and coherent, Fermi surface in the pseudogap phase of cuprates.



Field dependence of the oscillatory part of the torque for various temperature. Black solid lines are best fits to Lifshitz-Kosevich theory.


This work was published in :
- Jaudet C., Vignolles D., Audouard A., Levallois J., LeBoeuf D., Doiron-Leyraud N., Vignolle B. ,Nardone M., Zitouni A., Liang R., Bonn D.A., HardyW.N, Taillefer L., and Proust C. Physical Review Letters 100 187005 (2008).
de Haas-van Alphen Oscillations in the Underdoped High-Temperature Superconductor YBa2Cu3O6.5’.