Pseudogap of Metallic Layered Nickelate R2−xSrxNiO4 (R=Nd,Eu) Crystals Measured Using Angle-Resolved Photoemission Spectroscopy
M. Uchida, K. Ishizaka, P. Hansmann, Y. Kaneko, Y. Ishida, X. Yang, R. Kumai, A. Toschi, Y. Onose, R. Arita, K. Held, O. K. Andersen, S. Shin, Y. Tokura
DOI 10.1103/PhysRevLett.106.027001 · Physical Review Letters
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Abstract
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 x2−y2 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| R2-xSrxNiO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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