Probing the singlet character of the two-hole states in cuprate superconductors

G Ghiringhelli*, NB Brookes, LH Tjeng, T Mizokawa, O Tjernberg, AA Menovsky, P.G. Steeneken

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

Using spin-resolved resonant photoemission we have probed the singlet vs. triplet character of the two-hole state in the layered cuprates Bi2Sr2CaCu2O8+delta La2-xSrxCuO4 and Sr2CuO2Cl2. The combination of the photon circular polarization with the photoelectron spin detection gives access to the character of the photoemission final states, which correspond to the two-hole configurations localized at a (CuO4) site. In particular, the lowest energy state is found to have a very high singlet character in all the measured compounds. This can be considered as a strong indication of the existence and stability of the so-called Zhang-Rice singlets in the layered cuprates. (C) 2002 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Article numberPII S0921-4526(01)01488-0
Pages (from-to)34-35
Number of pages2
JournalPhysica B: Condensed Matter
Volume312
Publication statusPublished - Mar-2002
EventInternational Conference on Strongly Correlated Electron Systems (SCES 01) -
Duration: 6-Aug-200110-Aug-2001

Keywords

  • Zhang-rice singlet
  • cuprate
  • photoemission
  • SPIN

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