Synchrotron x-ray scattering study of charge-density-wave order in HgBa2CuO4+δ

Wojciech Tabis (1) , B. Yu (2) , I. Bialo (3) , M. Bluschke (4) , T. Kolodziej (5) , A. Kozlowski (3) , E. Blackburn (6) , K. Sen (7) , M. Forgan (6) , M. Zimmermann (8) , Y. Tang (2) , E. Weschke (9) , Baptiste Vignolle (1) , M. Hepting (4) , H. Gretarsson (4) , R. Sutarto , F. He , M. Le Tacon (7) , N. Barišić (2) , G. Yu (2) , M. Greven (2)

1 LNCMI-T - Laboratoire national des champs magnétiques intenses - Toulouse
2 School of Physics and Astronomy [Minneapolis]
3 AGH UST - AGH University of Science and Technology [Krakow, PL]
4 Max Planck Institute for Solid State Research
5 APS - Advanced Photon Source [ANL]
6 School of Physics and Astronomy [Birmingham]
7 ITF - Institut fur Theoretische Festkorperphysik
8 HASYLAB - Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen Synchrotron DESY
9 HZB - Helmholtz-Zentrum Berlin für Materialien und Energie GmbH = Helmholtz Centre Berlin for Materials and Energy = Centre Helmholtz de Berlin pour les matériaux et l'énergie

We present a detailed synchrotron x-ray scattering study of the charge-density-wave (CDW) order in simple tetragonal HgBa2CuO4+δ (Hg1201). Resonant soft x-ray scattering measurements reveal that short-range order appears at a temperature that is distinctly lower than the pseudogap temperature and in excellent agreement with a prior transient reflectivity result. Despite considerable structural differences between Hg1201 and YBa2Cu3O6+δ, the CDW correlations exhibit similar doping dependencies, and we demonstrate a universal relationship between the CDW wave vector and the size of the reconstructed Fermi pocket observed in quantum oscillation experiments. The CDW correlations in Hg1201 vanish already below optimal doping, once the correlation length is comparable to the CDW modulation period, and they appear to be limited by the disorder potential from unit cells hosting two interstitial oxygen atoms. A complementary hard x-ray diffraction measurement, performed on an underdoped Hg1201 sample in magnetic fields along the crystallographic c axis of up to 16 T, provides information on the form factor of the CDW order. As expected from the single-CuO2-layer structure of Hg1201, the CDW correlations vanish at half-integer values of L and appear to be peaked at integer L. We conclude that the atomic displacements associated with the short-range CDW order are mainly planar, within the CuO2 layers.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Wojciech Tabis, B. Yu, I. Bialo, M. Bluschke, T. Kolodziej, et al.. Synchrotron x-ray scattering study of charge-density-wave order in HgBa2CuO4+δ. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2017, 96 (13), pp.134510. ⟨10.1103/PhysRevB.96.134510⟩. ⟨hal-02159114⟩