Topic
High-temperature superconductivity
About: High-temperature superconductivity is a research topic. Over the lifetime, 7263 publications have been published within this topic receiving 175377 citations. The topic is also known as: high-temperature superconductivity.
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TL;DR: Granular superconductivity in powders of small graphite grains (several tens of micrometers) is demonstrated after treatment with pure water and provides evidence for the existence of superconducting vortices with some similarities to high-temperature granularsuperconducting oxides.
Abstract: Granular superconductivity in powders of small graphite grains (several tens of micrometers) is demonstrated after treatment with pure water. The temperature, magnetic field and time dependence of the magnetic moment of the treated graphite powder provides evidence for the existence of superconducting vortices with some similarities to high-temperature granular superconducting oxides but even at temperatures above 300 K. Room temperature superconductivity in doped graphite or at its interfaces appears to be possible.
103 citations
TL;DR: In this article, it was shown that the magnetic response of undoped and Ni-doped BaFe2As2 indicates that their magnetic characteristics are dominated by itinerant or localized magnetic moments.
Abstract: An outstanding question about the iron-based superconductors has been whether or not their magnetic characteristics are dominated by itinerant or localized magnetic moments. Absolute measurements and calculations of the magnetic response of undoped and Ni-doped BaFe2As2 indicate the latter.
102 citations
TL;DR: In this paper, it was shown that the one-dimensional model postulated by Labbe and Friedel to explain the properties of other high temperature superconductors is inconsistent with these measurements.
102 citations
TL;DR: In this paper, the authors further develop the theory of renormalized superconducting fluctuations in a strong field, taking account of layer structure in high temperature superconductors and renormalization of fluctuations of higher Landau levels.
Abstract: We further develop the theory of renormalized superconducting fluctuations in a strong field, taking account of layer structure in high temperature superconductors and renormalization of fluctuations of higher Landau levels, both of which we neglected in our previous works. Performing detailed comparisons with recent resistivity data for bulk single crystal samples of YBCO and BSCCO, we find that the resulting expressions of fluctuation conductivities quantitatively explain the broadening of resistive transition for both cases of the field perpendicular and parallel to current. In particular, the single expression for the case I ⊥ B can cover not only the broad transition region but also the flux flow region observed at lower temperature.
101 citations
TL;DR: The results show that doping produces a rapid metallization of the system and destroys antiferromagnetic order.
Abstract: We study a generalized Hubbard Hamiltonian which includes the Cu and O orbitals in the CuO/sub 2/ planes of high-/ital T//sub /ital c// superconductors. We use slave-boson technique to account for the intra- and interatomic correlations. In the saddle-point approximation we obtain the metal-insulator phase diagram and conclude that, for one hole per unit cell in the CuO/sub 2/ plane, La/sub 2/CuO/sub 4/ is a charge-transfer insulator. Our results show that doping produces a rapid metallization of the system and destroys antiferromagnetic order. Transport properties and mechanism for superconductivity are briefly discussed.
101 citations