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Updated: Jul 4, 2026

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Published on: March 24, 2019
de Haas-van Alphen oscillations in the underdoped high-temperature superconductor YBa2Cu3O6.5
Cyril Jaudet1, David Vignolles, Alain Audouard
1Laboratoire National des Champs Magnétiques Pulsés (CNRS-UPS-INSA), Toulouse, France.
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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