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.
Jaudet
Cyril
C
Laboratoire National des Champs Magnétiques Pulsés (CNRS-UPS-INSA), Toulouse, France.
Vignolles
David
D
Audouard
Alain
A
Levallois
Julien
J
LeBoeuf
D
D
Doiron-Leyraud
Nicolas
N
Vignolle
B
B
Nardone
M
M
Zitouni
A
A
Liang
Ruixing
R
Bonn
D A
DA
Hardy
W N
WN
Taillefer
Louis
L
Proust
Cyril
C