Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.027001
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Funding
- MEXT of Japan [20046004, 20340086]
- JSPS [21-5941]
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program)
- EU network MONAMI
- FWF [OK W004]
- Grants-in-Aid for Scientific Research [20046004] Funding Source: KAKEN
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We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R2-xSrxNiO4 (R = Nd, Eu), isostructural to La2-xSrxCuO4. Angle-resolved photoemission spectroscopy on the barely metallic Eu0.9Sr1.1NiO4 (R = Eu, x = 1.1) has revealed a large hole surface of x(2) - y(2) character with a high-energy pseudogap of the same symmetry and comparable magnitude with those of underdoped (x < 0.1) 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.
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