Spatially modulated 'Mottness' in La 2-x Ba x CuO 4

P. Abbamonte, A. Rusydi, S. Smadici, G. D. Gu, G. A. Sawatzky, D. L. Feng

Research output: Contribution to journalArticlepeer-review

Abstract

Competition between magnetism and the kinetic energy of mobile carriers (typically holes) in doped antiferromagnets may lead to 'stripe' phases 1-4 , which are charged rivers separating regions of oppositely phased antiferromagnetism. In copper oxides the main experimental evidence for such coexisting static spin and charge order comes from neutron scattering in La 1.48 Nd 0.4 Sr 0.12 CuO 4 (LNSCO; ref. 5) and La 1.875 Ba 0.125 CuO 4 (LBCO; ref. 6). However, as a neutron is neutral, it does not detect charge but rather its associated lattice distortion 7 , so it is not known whether the stripes involve ordering of the doped holes. Here we present a study of the charge order in LBCO with resonant soft X-ray scattering (RSXS). We observe giant resonances near the Fermi level as well as near the correlated gap 8,9 , demonstrating significant modulation in both the doped-hole density and the 'Mottness', or the degree to which the system resembles a Mott insulator 10 . The peak-to-trough amplitude of the valence modulation is estimated to be 0.063 holes, which suggests 11 an integrated area of 0.59 holes under a single stripe, close to the expected 0.5 for half-filled stripes.

Original languageEnglish (US)
Pages (from-to)155-158
Number of pages4
JournalNature Physics
Volume1
Issue number3
DOIs
StatePublished - Dec 1 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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