Abstract

We consider the effects of a perpendicular magnetic field on the d-density-wave order and conclude that if the pseudogap phase in the cuprates is due to this order, then it is highly insensitive to the magnetic field in the underdoped regime, while its sensitivity increases as the gap vanishes in the overdoped regime. This appears to be consistent with the available experiments and can be tested further in neutron-scattering experiments. We also investigate the nature of the de Haas--van Alphen effect in the ordered state and discuss the possibility of observing it.

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