Abstract
We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, (), isostructural to . Angle-resolved photoemission spectroscopy on the barely metallic (, ) has revealed a large hole surface of character with a high-energy pseudogap of the same symmetry and comparable magnitude with those of underdoped () cuprates, although the antiferromagnetic interactions are 1 order of magnitude smaller. This finding strongly indicates that the momentum-dependent pseudogap feature in the layered nickelate arises from the real-space charge correlation.
- Received 28 May 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.027001
© 2011 The American Physical Society