Quantum oscillations in magnetic-field–induced antiferromagnetic phase of underdoped cuprates: Application to ortho-II YBa 2 Cu 3 O 6.5

摘要

Magnetic field induced antiferromagnetic phase of the underdoped cuprates isstudied within the t-t'-J model. A magnetic field suppresses the pairingamplitude, which in turn may induce antiferromagnetism. We apply our theory tointerpret the recently reported quantum oscillations in high magnetic field inortho-II YBa2Cu3O6.5 and propose that the total hole density abstracted fromthe oscillation period is reduced by 50% due to the antiferromagnetism.