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.
Highlights
Antiferromagnetic correlations have been argued to be the cause of the d-wave superconductivity and the pseudogap phenomena exhibited by the cuprates
Most of the detailed knowledge about magnetic fluctuations in the cuprates comes from neutronscattering studies of La2-xSrxCuO4 (LSCO) and YBa2Cu3O6 þ y (YBCO)[1,2]
The momentum (Q) and energy- (o) dependent dynamic magnetic susceptibility w00(Q,o) of LSCO is characterized by an X-shaped hourglass spectrum that disperses with increasing energy from incommensurate wave vectors at oE0 towards the antiferromagnetic wave vector qAF, and outward again at higher energies[1,3]
Summary
Antiferromagnetic correlations have been argued to be the cause of the d-wave superconductivity and the pseudogap phenomena exhibited by the cuprates. We present an inelastic neutron-scattering study of the magnetic excitations of an underdoped Hg1201 sample with TcE71 K and hole doping pE0.095 (labelled HgUD71; see Methods, Supplementary Notes 1–2 and Supplementary Figs 1–5 for detailed experimental and analysis information) This is a interesting doping level because it corresponds to the shoulder of the ‘SC dome’, where Tc appears to be slightly suppressed, and because a cascade of phenomena have been observed: quasi-static q 1⁄4 0 magnetic order[16,17] below T*, short-range CDW correlations[15] below TCDWE200 K, evidence for Fermi-liquid transport in the PG state[19,20,21], and Shubnikov-de Haas oscillations (below 4 K in magnetic fields above 60 T) This establishes the commensurate excitations as a signature of the PG state
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