Study of the high-energy antiferromagnetic excitations in the under-doped high-temperature superconductor HgBa2CuO4+d
One of the central issues in high-temperature superconductivity is to clarify the interplay between magnetism and superconductivity. Considerable work has been directed towards understanding the magnetic resonance and the seemingly universal hourglass-like magnetic dispersion near the antiferromagnetic (AF) wave-vector. The upper part of the hourglass is typically interpreted as due to AF correlations that persist from the undoped parent compounds up to optimal doping. This observation inspired numerous theoretical interpretations. Our ability to grow large Hg1201 single crystals has allowed us to study various magnetic excitations in the model-cuprate including the resonance, and the novel pseudogap state magnetic excitations. High energy AF correlations has never been studied in Hg1201 and the next-nearest-neighbor superexchange is unknown. Since Hg1201 has the highest TC of the single-layer cuprates, it is highly desirable to study AF correlations in this material. We here propose to take advantage of the high flux and hot beam available at IN1 in order to measure the high energy magnons, determine their dispersion, and extract the superexchange coefficient in underdoped Hg1201.
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GREVEN Martin; Bourges; CHAN Mun; DOROW Chelsey; JIMENEZ RUIZ Monica; LI Yangmu; LI Yuan; MANGIN-THRO Lucile; SIDIS Yvan; STEFFENS Paul and YU Guichuan. (2012). Study of the high-energy antiferromagnetic excitations in the under-doped high-temperature superconductor HgBa2CuO4+d. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1165
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