Volume 82, Number 1, April 2008
Article Number 17004
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 12 March 2008
EPL, 82 (2008) 17004
DOI: 10.1209/0295-5075/82/17004

Quantum oscillations in magnetic-field-induced antiferromagnetic phase of underdoped cuprates: Application to ortho-II YBa2Cu3O6.5

Wei-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$^\prime$ - 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).

© EPLA 2008