Electronic states of doped holes in La(2-x)SrxCuO4: A unique application of XAFS

Edward A. Stern, Victor Z. Polinger, Daniel Haskel

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Polarized XAFS measurements on powder of La2-cursive Greek chiSrcursive Greek chiCuO4 with aligned c-axes find that apical oxygens neighboring only the Sr dopants have a double-site distribution. The occupation of both sites totals one oxygen, is independent of temperature, but changes with cursive Greek chi. A theory of the double-site is presented in terms of Jahn-Teller distortions (JT) induced by the extrinsic doped holes paired with the intrinsic holes present in the undoped cursive Greek chi = 0 sample. These pairs reside in singlet and triplet impurity states and satisfy Bose statistics. It is speculated that high Tc occurs because of Bose-condensation of the singlet pairs. Because of the strong electron-lattice interaction of the JT effect, XAFS can determine the corresponding electronic states in this special case.

Original languageEnglish
Pages (from-to)373-375
Number of pages3
JournalJournal of Synchrotron Radiation
Volume6
Issue number3
DOIs
StatePublished - 1 May 1999
Externally publishedYes

Keywords

  • Impurity States
  • Jahn-Teller distortions
  • Superconductivity

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