Two energy scales in the spin excitations of the high-temperature superconductor La2-xSrxCuO4
B Vignolle,Stephen M Hayden,Desmond F. McMorrow,Desmond F. McMorrow,Henrik M. Rønnow,Bella Lake,Christopher D. Frost,Toby Perring +7 more
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In this article, the authors used inelastic neutron scattering to demonstrate that collective spin excitations in optimally doped La2−xSrxCuO4 are more structured than previously thought.Abstract:
The excitations responsible for producing high-temperature superconductivity in the copper oxides have yet to be identified. Two promising candidates are collective spin excitations and phonons1. A recent argument against spin excitations is based on their inability to explain structures observed in electronic spectroscopies such as photoemission2,3,4,5 and optical conductivity6,7. Here, we use inelastic neutron scattering to demonstrate that collective spin excitations in optimally doped La2−xSrxCuO4 are more structured than previously thought. The excitations have a two-component structure with a low-frequency component strongest around 18 meV and a broader component peaking near 40–70 meV. The second component carries most of the spectral weight and its energy matches structures observed in photoemission2,3,4,5 in the range 50–90 meV. Our results demonstrate that collective spin excitations can explain features of electronic spectroscopies and are therefore likely to be strongly coupled to the electron quasiparticles.read more
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The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
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Intense paramagnon excitations in a large family of high-temperature superconductors
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Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor
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TL;DR: In this paper, a self-consistent description of charge and spin-excitation spectra determined by angle-resolved photoemission and inelastic neutron scattering, respectively, on the same crystals of the high-temperature superconductor YBa2Cu3O6.6.
References
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Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors.
Alessandra Lanzara,P. V. Bogdanov,Xingjiang Zhou,S. A. Kellar,Donglai Feng,E. D. Lu,Teppei Yoshida,Hiroshi Eisaki,Atsushi Fujimori,Koji Kishio,Jun-ichi Shimoyama,Takeshi Noda,Shin-ichi Uchida,Zahid Hussain,Zhi-Xun Shen +14 more
TL;DR: In this paper, angle-resolved photoemission spectroscopy was used to study electron velocities and scattering rates in three different families of copper oxide superconductors.
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Electrodynamics of high- T c superconductors
Dmitri Basov,Thomas Timusk +1 more
TL;DR: In this article, a review of the electromagnetic response of high-Tc superconductors using terahertz, infrared, and optical spectroscopies is presented, with an emphasis on conceptual issues, including evolution of the electronic spectral weight in doped Mott-Hubbard insulators, the d-wave superconducting energy gap and the normal-state pseudogap, anisotropic superfluid response, electronic phase segregation, emergence of coherent electronic state as a function of both temperature and doping, the vortex state, and the energetics of the super
Journal ArticleDOI
Quantum magnetic excitations from stripes in copper oxide superconductors
John M. Tranquada,Hyungje Woo,Hyungje Woo,Toby Perring,H. Goka,Genda Gu,Guangyong Xu,Masaki Fujita,Kazuyoshi Yamada +8 more
TL;DR: In this article, it was shown that the observed spectrum can be understood within a stripe model by taking account of quantum excitations, which supports the concept that stripe correlations are essential to high-transition-temperature superconductivity.
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Spin waves and electronic interactions in La2CuO4
Radu Coldea,Radu Coldea,Stephen M Hayden,Gabriel Aeppli,Toby Perring,Christopher D. Frost,T.E. Mason,S. W. Cheong,Zachary Fisk +8 more
TL;DR: The observed dispersion relation shows evidence for substantial interactions beyond the nearest-neighbor Heisenberg term which can be understood in terms of a cyclic or ring exchange due to the strong hybridization path around the Cu4O4 square plaquettes.