Pseudogap of metallic layered nickelate R2-xSr xNiO4 (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

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Abstract

We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R2-xSrxNiO 4 (R=Nd,Eu), isostructural to La2-xSrxCuO 4. 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.

Original languageEnglish
Article number027001
JournalPhysical Review Letters
Volume106
Issue number2
DOIs
Publication statusPublished - 2011 Jan 12
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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