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  • Commensurate antiferromagnetic excitations as a signature of the pseudogap in the tetragonal high-T-c cuprate HgBa2CuO4+delta NATURE COMMUNICATIONS 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. 2016; 7


    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.

    View details for DOI 10.1038/ncomms10819

    View details for Web of Science ID 000371714100001

    View details for PubMedID 26940332

    View details for PubMedCentralID PMC4785222