Quantum oscillations in magnetic-field-induced antiferromagnetic phase of underdoped cuprates: Application to ortho-II YBa2Cu3O6.5Wei-Qiang Chen1, Kai-Yu Yang1, T. M. Rice1, 2 and F. C. Zhang1
1 Department of Physics and Center of Theoretical and Computational Physics, University of Hong Kong Hong Kong, China
2 Institut für Theoretische Physik, ETH-Zürich - CH-8093 Zürich, Switzerland
received 22 November 2007; accepted in final form 8 February 2008; published April 2008
published online 12 March 2008
The magnetic-field-induced antiferromagnetic phase of the underdoped cuprates is studied within the t - t - J model. A magnetic field suppresses the pairing amplitude, which, in turn, may induce antiferromagnetism. We apply our theory to interpret the recently reported quantum oscillations in high magnetic field in ortho-II YBa2Cu3O6.5 (Doiron-Leyraud N. et al., Nature, 447 (2007) 565) and propose that the total hole density abstracted from the oscillation period is reduced by 50% due to doubling of the unit cell.
74.20.Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.).
74.20.-z - Theories and models of superconducting state.
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds).
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