Spatially modulated 'Mottness' in La2-xBaxCuO4
By P. Abbamonte, A. Rusydi, S. Smadici, G. Gu, G. Sawatzky, D. Feng. 2005
291 citations recorded by the source corpus.
Competition between magnetism and the kinetic energy of mobile carriers (typically holes) in doped antiferromagnets may lead to ‘stripe’ phases1,2,3,4, 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 La1.48Nd0.4Sr0.12CuO4 (LNSCO; ref. 5) and La1.875Ba0.125CuO4 (LBCO; ref. 6). However, as a neutron is neutral, it does not detect charge but rather its associated lattice distortion7, 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 gap8,9, demonstrating significant modulation in both the doped-hole density and the ‘Mottness’, or the degree to which the system resembles a Mott insulator10. The peak-to-trough amplitude of the valence modulation is estimated to be 0.063 holes, which suggests11 an integrated area of 0.59 holes under a single stripe, close to the expected 0.5 for half-filled stripes.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/0f7ce00195622591fe5392b79179723ac38f3d35
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Citations in the corpus
- Angle-resolved photoemission studies of quantum materials (2020, unknown): “…1993; Tsuei et al., 1994; Wollman et al., 1993), a valence electron charge density wave (CDW, also simply called “charge order”) and spin stripes (Abbamonte et al., 2005; Ghiringhelli et al., 2012; da Silva Neto et al., 2016; Tranquada et al., 1995), non-Fermi liquid charge transport (often…”
- Nonlinear light–matter interaction at terahertz frequencies (2016, background): “5) wave vector [88,113,114], while the LTT distortion can be directly measured through the (001) diffraction peak that is structurally forbidden in the high-temperature phases [115].”