Long-Range Incommensurate Charge Fluctuations in (Y,Nd)Ba2Cu3O6+x
By G. Ghiringhelli, M. Tacon, M. Minola, S. Blanco-Canosa, C. Mazzoli, N. Brookes, G. M. D. Luca, A. Frano, D. Hawthorn, F. He and 10 more. Science, 2012
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A State of High Tc Superconductivity There are strong indications that high-temperature superconductivity in the cuprates is formed amid competing orders, but only two have been observed unambiguously. The so-called stripe order has been observed in a Lanthanum-based cuprate family and consists of coexisting charge-and-spin modulations and occurs at a characteristic dopant concentration in which the critical temperature Tc has a dip. Now, Ghiringhelli et al. (p. 821, published online 12 July; see the Perspective by Tranquada) have used resonant inelastic x-ray scattering to uncover a related but apparently two-dimensional charge order in the much cleaner YBCO cuprate family. The charge fluctuations were not commensurate with the lattice and did not originate in the characteristic oxygen chains of YBCO. The order appeared only in a narrow interval of dopant concentrations and competed with superconductivity, which provides a natural explanation for a plateau in Tc observed in the same range. Scattering experiments uncover an order competing with superconductivity in a cuprate family. The concept that superconductivity competes with other orders in cuprate superconductors has become increasingly apparent, but obtaining direct evidence with bulk-sensitive probes is challenging. We have used resonant soft x-ray scattering to identify two-dimensional charge fluctuations with an incommensurate periodicity of ~3.2 lattice units in the copper-oxide planes of the superconductors (Y,Nd)Ba2Cu3O6+x, with hole concentrations of 0.09 to 0.13 per planar Cu ion. The intensity and correlation length of the fluctuation signal increase strongly upon cooling down to the superconducting transition temperature (Tc); further cooling below Tc abruptly reverses the divergence of the charge correlations. In combination with earlier observations of a large gap in the spin excitation spectrum, these data indicate an incipient charge density wave instability that competes with superconductivity.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/33ce79b5767062567048d11fe5151a507486fc86
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Citations in the corpus
- Angle-resolved photoemission studies of quantum materials (2020, neutral): “…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 referred to as a “strange…”
- A broken translational symmetry state in an infinite-layer nickelate (2021, background): “Thus, the short-range CO in LaNiO2 appears to bear more resemblance to the CO in Bi-, Y-, and Hg-based cuprates [24-26].”
- A Quantum Critical Point Lying Beneath the Superconducting Dome in Iron Pnictides (2013, background): “Within the pseudogap phase there seems to be another critical point close to p = 1/8 where charge ordering [36, 60, 61] leading to Fermi surface reconstruction [62] is observed.”