Pseudogap of Metallic Layered Nickelate R2xSrxNiO4 (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, and Y. Tokura
Phys. Rev. Lett. 106, 027001 – Published 12 January 2011

Abstract

We have investigated charge dynamics and electronic structures for single crystals of metallic layered nickelates, R2xSrxNiO4 (R=Nd,Eu), isostructural to La2xSrxCuO4. Angle-resolved photoemission spectroscopy on the barely metallic Eu0.9Sr1.1NiO4 (R=Eu, x=1.1) has revealed a large hole surface of x2y2 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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  • Received 28 May 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.027001

© 2011 The American Physical Society

Authors & Affiliations

M. Uchida1, K. Ishizaka1, P. Hansmann2, Y. Kaneko3, Y. Ishida4, X. Yang5, R. Kumai6, A. Toschi2, Y. Onose1,3, R. Arita1, K. Held2, O. K. Andersen5, S. Shin4,7, and Y. Tokura1,3,8

  • 1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 2Institut for Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria
  • 3Multiferroics Project, ERATO, Japan Science and Technology Agency (JST), Tokyo 113-8656, Japan
  • 4Institute for Solid State Physics (ISSP), University of Tokyo, Chiba 277-8561, Japan
  • 5Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany
  • 6National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan
  • 7RIKEN SPring-8 Center, Hyogo 679-5148, Japan
  • 8Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group (CERG), ASI, RIKEN, Wako 351-0198, Japan

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Vol. 106, Iss. 2 — 14 January 2011

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