Electron Doping of the Parent Cuprate La2CuO4 without Cation Substitution

Haofei I. Wei, Carolina Adamo, Elizabeth A. Nowadnick, Edward B. Lochocki, Shouvik Chatterjee, Jacob P. Ruf, Malcolm R. Beasley, Darrell G. Schlom, Kyle M. Shen

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

In the cuprates, carrier doping of the Mott insulating parent state is necessary to realize superconductivity as well as a number of other exotic states involving charge or spin density waves. Cation substitution is the primary method for doping carriers into these compounds, and is the only known method for electron doping in these materials. Here, we report electron doping without cation substitution in epitaxially stabilized thin films of La2CuO4 grown via molecular-beam epitaxy. We use angle-resolved photoemission spectroscopy to directly measure their electronic structure and conclusively determine that these compounds are electron doped with a carrier concentration of 0.09±0.02 e-/Cu. We propose that intrinsic defects, most likely oxygen vacancies, are the sources of doped electrons in these materials. Our results suggest a new approach to electron doping in the cuprates, one which could lead to a more detailed experimental understanding of their properties.

Original languageEnglish (US)
Article number147002
JournalPhysical Review Letters
Volume117
Issue number14
DOIs
StatePublished - Sep 28 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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