de Haas-van Alphen oscillations in the underdoped high-temperature superconductor YBa2Cu3O6.5.
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.
Laboratoire National des Champs Magnétiques Pulsés (CNRS-UPS-INSA), Toulouse, France.
Cyril
C
Jaudet
David
D
Vignolles
Alain
A
Audouard
Julien
J
Levallois
D
D
LeBoeuf
Nicolas
N
Doiron-Leyraud
B
B
Vignolle
M
M
Nardone
A
A
Zitouni
Ruixing
R
Liang
D A
DA
Bonn
W N
WN
Hardy
Louis
L
Taillefer
Cyril
C
Proust