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Strong Electron-Phonon Interaction in HTSCs | Superconductivity's Weblog
https://superconductivity.wordpress.com/2007/11/07/strong-electron-phonon-interaction-in-htscs
Recent important progresses in the filed of HTSCs. Strong Electron-Phonon Interaction in HTSCs. There is a clear kink in the electronic dispersion curves around 50-80 meV (Fig. 1) for all the samples in different values of doping and temperature (below and above T. This kink clearly persists above T. But a thermal broadening is present. There is also a dip feature in all the spectra in Fig. 2 near 55-70 meV. Fig. 3b sows the doping dependence of this dip energy in the (0,π) direction. 2) calculations sho...
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Coupling of Charge Carriers to the Spin Fluctuation | Superconductivity's Weblog
https://superconductivity.wordpress.com/2008/01/08/coupling-of-charge-carriers-to-the-spin-fluctuation
Recent important progresses in the filed of HTSCs. Coupling of Charge Carriers to the Spin Fluctuation. In an electron-phonon system the electron-phonon interaction spectral density, α. F(ω), is approximately equal to W(ω) defined as:. Is the real part of the optical conductivity. For the electron-spin interaction systems this relation could be converted to I. The calculated W(ω Δ. From Eq. 1 for optimal doped YBCO (with the gap amplitude Δ. Function has been derived (by Eq. 1) from the calculated. The s...
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Superconductivity at 43 K in LaO1-xFxFeAs under High Pressures | Superconductivity's Weblog
https://superconductivity.wordpress.com/2008/06/15/superconductivity-at-43-k-in-lao1-xfxfeas-under-high-pressures
Recent important progresses in the filed of HTSCs. Superconductivity at 43 K in LaO1-xFxFeAs under High Pressures. Just recently, Japanese scientists have discovered that the T. Of iron-based layer compound LaO. FeAs would be increased till 43 K for x=0.11 and at 4 GPa mechanical pressure, which is the highest T. Has been reported for this family of superconductors. The result indicates that this system would have potential to reach higher T. In comparable with the T. By mechanical pressure in this system.
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Related Conferences | Superconductivity's Weblog
https://superconductivity.wordpress.com/htscs-related-conferences
Recent important progresses in the filed of HTSCs. 25-30 Sep. 2007, Khiva, Uzbekistan. This conference will be an interdisciplinary forum for exchange on the latest experimental results and theoretical advances in magnetism and superconductivity. The conference will bring together world recognized experts and younger researchers to stimulate discussions and push leading edge research and collaborations and explore some of the big challenges in the field. Nov 5-7, 2007- Tsukuba, Japan. This symposium is s...
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High Energy Magnetic Excitations in YBCO | Superconductivity's Weblog
https://superconductivity.wordpress.com/2007/11/20/high-energy-magnetic-excitations-in-ybco
Recent important progresses in the filed of HTSCs. High Energy Magnetic Excitations in YBCO. Dramatic changes in the magnetic excitation spectrum by going to the superconducting state of HTSCs, known as the resonance peak, have been considered as a strong evidence for the magnetic pairing mechanism of superconductivity in these systems. The resonance peak occurs at E. 41 and 34 meV [at q=(0.5, 0.5) in the CuO. Reciprocal lattice units (rlu)] respectively for optimal doped YBCO. And below the E. 05 ε,0...
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Electron-Boson Interaction: Phonons or Magnetic Modes? | Superconductivity's Weblog
https://superconductivity.wordpress.com/2007/11/14/electron-boson-interaction-phonons-or-magnetic-modes
Recent important progresses in the filed of HTSCs. Electron-Boson Interaction: Phonons or Magnetic Modes? Spectra for Bi2212 in different doping value (0.12-0.24 of hole concentration) which give information about the superconducting gap and boson energy Ω. Because is inhomogeneous in atomic scale, the atomic scale information of Ω and their correlation also give valuable information. Their most important results could be summarized as:. Ω(r)=Π(r)- (r) [Π(r) is the position of peak in. E- (r) and integra...
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Abou me | Superconductivity's Weblog
https://superconductivity.wordpress.com/abou-me
Recent important progresses in the filed of HTSCs. System by Inelastic X-ray Scattering experiments. Now, I am postdoctoral researcher at the Institute of multidisciplinary research for advanced material (IMRAM) of Tohoku University (Sendai, Japan). My research subject is “Radiation and thermophysical properties of molten metals and semiconductors”. My hobbies are hiking, chess, cooking and watching movies. Some parts of my CV and the abstract of my studies are presented in the following:. 5 A Tavana,.
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Magnetic Resonance Mode and Its Relation with Thermodynamics of HTSCs | Superconductivity's Weblog
https://superconductivity.wordpress.com/2007/12/17/resonance-magnetic-mode-and-its-relation-with-thermodynamics-of-htscs
Recent important progresses in the filed of HTSCs. Magnetic Resonance Mode and Its Relation with Thermodynamics of HTSCs. The most prominent feature of spin fluctuation in YBCO. System is the 41 meV resonance peak which appears below the T. With x=0.6, 0.7, 0.8, 0.93 (T. In x=0.6 sample a resonance peak at 34 meV appears in the acoustic mode (in-phase magnetic fluctuation of the coupled CuO. Planes) of the local [ dq. The resonance peak also exist in the temperature above T. DT versus the doping and temp...
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Is Continuum Background More Important Than Resonance Mode? | Superconductivity's Weblog
https://superconductivity.wordpress.com/2007/11/25/is-continuum-background-more-important-than-resonance-mode
Recent important progresses in the filed of HTSCs. Is Continuum Background More Important Than Resonance Mode? The observed sharp ‘kink’ in the ARPES has been related to the phonon or magnetic mode as a possible signature of the force that create the superconducting state in HTSCs. A group of scientists from Canada and the USA have studied this situation by Fourier-transform infrared (FTIR) spectroscopy of optimally doped (T. 96 K) and highly overdoped (T. Most important results of this study:. The ampli...
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Special Relationship between Real and Momentum Spaces | Superconductivity's Weblog
https://superconductivity.wordpress.com/2007/12/05/special-relationship-between-real-and-momentum-spaces
Recent important progresses in the filed of HTSCs. Special Relationship between Real and Momentum Spaces. Pairs of maximal intensity in the Fourier transform of r-space local density of states, corresponding to each vector connected the end of each banana (Fig. 1). To detect such a pattern the atomic resolution is requires for all measurements and the filed of view at the measurements should be L 450 Å ( q=2π/L to be enough small). Fig. 2 shows such a resolution. Although the g( q. From the same positive...
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