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Commensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa$_2$CuO$_{4+\delta}$

Authors
  • Chan, M. K.
  • Dorow, C. J.
  • Mangin-Thro, L.
  • Tang, Y.
  • Ge, Y.
  • Veit, M. J.
  • Yu, G.
  • Zhao, X.
  • Christianson, A. D.
  • Park, J. T.
  • Sidis, Y.
  • Steffens, P.
  • Abernathy, D. L.
  • Bourges, P.
  • Greven, M.
Type
Published Article
Publication Date
Jan 19, 2016
Submission Date
Feb 18, 2014
Identifiers
DOI: 10.1038/ncomms10819
Source
arXiv
License
Yellow
External links

Abstract

Antiferromagnetic correlations have been argued to be the cause of the d-wave superconductivity and the pseudogap phenomena exhibited by the cuprates. Although the antiferromagnetic response in the pseudogap state has been reported for a number of compounds, there exists no information for structurally simple HgBa$_2$CuO$_{4+\delta}$. Here we report neutron scattering results for HgBa$_2$CuO$_{4+\delta}$ (superconducting transition temperature T$_c$ $\sim$ 71 K, pseudogap temperature T* $\sim$ 305 K) that demonstrate the absence of the two most prominent features of the magnetic excitation spectrum of the cuprates: the X-shaped 'hourglass' response and the resonance mode in the superconducting state. Instead, the response is Y-shaped, gapped, and significantly enhanced below T*, and hence a prominent signature of the pseudogap state.

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