We find contrastive response of the pseudogap (PG) to high magnetic fields up to 28.5 T based on 63Cu NMR measurements. In the slightly overdoped TlSr2CaCu2O6.8, the PG is strongly field dependent and shown to be due to the superconducting fluctuations. By contrast, the PG in the underdoped YBa2Cu4O8 does not depend on magnetic fields up to 28.5 T. These results imply that there exists a field-insensitive PG up to a certain doping level beyond which it is taken over by the superconducting fluctuations-induced one.
- High magnetic field
- Superconducting fluctuations
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering