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Title: Synchrotron x-ray scattering study of charge-density-wave order in HgBa 2 CuO 4 + δ

Journal Article · · Physical Review B

We present a detailed synchrotron x-ray scattering study of the charge-density-wave (CDW) order in simple tetragonal HgBa2CuO4+delta (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+delta, the CDWcorrelations exhibit similar doping dependencies, and we demonstrate a universal relationship between the CDWwave vector and the size of the reconstructed Fermi pocket observed in quantum oscillation experiments. The CDWcorrelations in Hg1201 vanish already below optimal doping, once the correlation length is comparable to the CDWmodulation 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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Sciences and Engineering Research Council of Canada (NSERC)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1467621
Journal Information:
Physical Review B, Vol. 96, Issue 13; ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

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