O. J. Lipscombe

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We report a detailed inelastic neutron scattering study of the collective magnetic excitations of overdoped superconducting La(1.78)Sr(0.22)CuO(4) for the energy range 0-160 meV. Our measurements show that overdoping suppresses the strong response present for optimally doped La(2-x)Sr(x)CuO(4) which is peaked near 50 meV. The remaining response is peaked at(More)
The presence or absence of a quantum critical point and its location in the phase diagram of high-temperature superconductors have been subjects of intense scrutiny. Clear evidence for quantum criticality, particularly in the transport properties, has proved elusive because the important low-temperature region is masked by the onset of superconductivity. We(More)
We use inelastic neutron scattering to measure the magnetic excitations in underdoped La2-xSrxCuO4 (x=0.085, T_{c}=22 K) for large energy (5<E<200 meV) and temperature (5<T<300 K) ranges. At low T, the response is highly structured in E and q, with peaks in the local susceptibility at 15 and 50 meV and a four-peaked structure in q for E approximately 185(More)
We use neutron scattering to show that spin waves in the iron chalcogenide Fe(1.05)Te display novel dispersion clearly different from both the first principles density functional calculations and recent observations in the related iron pnictide CaFe(2)As(2). By fitting to a Heisenberg Hamiltonian, we find that although the nearest-neighbor exchange(More)
C. G. Fatuzzo,1 Y. Sassa,2 M. Månsson,1,3,4 S. Pailhès,3,5 O. J. Lipscombe,6 S. M. Hayden,6 L. Patthey,7 M. Shi,7 M. Grioni,1 H. M. Rønnow,1 J. Mesot,1,2,3 O. Tjernberg,4 and J. Chang1,7,3 1Institute for Condensed Matter Physics, École Polytechnique Fedérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland 2Laboratory for Solid State Physics, ETH Zürich,(More)
High-temperature superconductivity emerges from an un-conventional metallic state. This has stimulated strong efforts to understand exactly how Fermi liquids breakdown and evolve into an un-conventional metal. A fundamental question is how Fermi liquid quasiparticle excitations break down in momentum space. Here we show, using angle-resolved photoemission(More)
O. J. Lipscombe,1,* Leland W. Harriger,1 P. G. Freeman,2 M. Enderle,2 Chenglin Zhang,1 Miaoying Wang,1 Takeshi Egami,1,3,4 Jiangping Hu,5,6 Tao Xiang,6,7 M. R. Norman,8 and Pengcheng Dai1,4,6,† 1Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA 2Institut Laue-Langevin, 6, rue Jules Horowitz, BP 156, 38042(More)
O. J. Lipscombe, ∗ G.F. Chen, Chen Fang, T.G. Perring, D.L. Abernathy, A.D. Christianson, Takeshi Egami, 5 Nanlin Wang, Jiangping Hu, 2 and Pengcheng Dai 5, 2, † The University of Tennessee, Knoxville, Tennessee 37996-1200, USA Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China Department of Physics, Purdue University, West Lafayette,(More)
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