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Electrons, holes, and spin in Nd2xCexCuO4δ

O. Tjernberg, L. H. Tjeng, P. G. Steeneken, G. Ghiringhelli, A. A. Nugroho, A. A. Menovsky, and N. B. Brookes
Phys. Rev. B 67, 100501(R) – Published 7 March 2003
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Abstract

The spin nature of the states at the top of the valence band in Nd2CuO4 and Nd1.85Ce0.15CuO4δ has been investigated with spin polarized resonant photoemission. A clear Zhang-Rice singlet state is observed at the top of the valence band in the undoped compound showing that the parent compound of this electron doped superconductor is similar to the parent compounds of hole doped cuprate superconductors. Upon doping, the stability of the singlet is destroyed and the optimum doped compound Nd1.85Ce0.15CuO4δ does not display any well-separated singlet state. These results indicate that hole contribution to the superconductivity in this system is not important in contrast to what has previously been suggested on the bases of transport measurements.

  • Received 8 January 2003

DOI:https://doi.org/10.1103/PhysRevB.67.100501

©2003 American Physical Society

Authors & Affiliations

O. Tjernberg1,2,*, L. H. Tjeng3, P. G. Steeneken4, G. Ghiringhelli2,5, A. A. Nugroho6, A. A. Menovsky6, and N. B. Brookes2

  • 1Laboratory of Materials and Semiconductor Physics, Royal Institute of Technology, Electrum 229, S-164 40 Kista, Sweden
  • 2ESRF-European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
  • 3II. Physikalisches Institut, Universtät zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany
  • 4Solid State Physics Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
  • 5INFM, Dipartimento di Fisica, Pilitecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy
  • 6Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands

  • *Electronic address: oscar@kth.se

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Vol. 67, Iss. 10 — 1 March 2003

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