Commensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-Tc cuprate HgBa2CuO4+δ

M. K. Chan (), C. J. Dorow, L. Mangin-Thro, Y. Tang, Y. Ge, M. J. Veit, G. Yu, X. Zhao, A. D. Christianson, J. T. Park, Y. Sidis, P. Steffens, D. L. Abernathy, P. Bourges and M. Greven ()
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M. K. Chan: School of Physics and Astronomy, University of Minnesota
C. J. Dorow: School of Physics and Astronomy, University of Minnesota
L. Mangin-Thro: Laboratoire Léon Brillouin, LLB/IRAMIS, UMR12, CEA-CNRS, CEA-Saclay
Y. Tang: School of Physics and Astronomy, University of Minnesota
Y. Ge: School of Physics and Astronomy, University of Minnesota
M. J. Veit: School of Physics and Astronomy, University of Minnesota
G. Yu: School of Physics and Astronomy, University of Minnesota
X. Zhao: School of Physics and Astronomy, University of Minnesota
A. D. Christianson: Oak Ridge National Laboratory
J. T. Park: Forschungsneutronenquelle Heinz Maier-Leibnitz
Y. Sidis: Laboratoire Léon Brillouin, LLB/IRAMIS, UMR12, CEA-CNRS, CEA-Saclay
P. Steffens: Institute Laue Langevin
D. L. Abernathy: Oak Ridge National Laboratory
P. Bourges: Laboratoire Léon Brillouin, LLB/IRAMIS, UMR12, CEA-CNRS, CEA-Saclay
M. Greven: School of Physics and Astronomy, University of Minnesota

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: 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 HgBa2CuO4+δ. Here we report neutron-scattering results for HgBa2CuO4+δ (superconducting transition temperature Tc≈71 K, pseudogap temperature T*≈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.

Date: 2016
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DOI: 10.1038/ncomms10819

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