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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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Journal ArticleDOI
TL;DR: In this paper, a model for the high temperature part of the conductor-superconductor transition region of high T/sub c/superconductors is presented, where the model incorporates number and mobility noises of charge carriers.
Abstract: Very recently, significant progress has been achieved in the understanding of the excessive strength and behavior of the conductance noise in the conductor-superconductor transition region of high T/sub c/ superconductors. For the high temperature part of the conductor-superconductor transition region, the model incorporates number and mobility noises of charge carriers: while in the low temperature part of the transition, classical and novel percolation noise effects (including possible effects due to flux motion) determine the behavior of the measured noise. In present high-quality (in situ annealed) films, the novel percolation noise effect ("p-noise," Phys. Rev. Lett., vol. 71, p. 2817, 1993) seems to be the most important. Some other important topics will also be briefly examined in this review: magnetic noise, noise in devices, and practical problems of measurements (e.g., comparison of the noise of different materials, temperature fluctuations). >

52 citations

Journal ArticleDOI
TL;DR: Electronic structure calculations and X-ray diffraction measurements presented here challenge long held beliefs, finding that only modest pressures are required to transform LaMnPO, isostructural to superconducting host LaFeAsO, from an antiferromagnetic insulator to a metallic antiferrosagnet, where the Mn moment vanishes in a second pressure-driven transition.
Abstract: Widespread adoption of superconducting technologies awaits the discovery of new materials with enhanced properties, especially higher superconducting transition temperatures T-c. The unexpected discovery of high T-c superconductivity in cuprates suggests that the highest T(c)s occur when pressure or doping transform the localized and moment-bearing electrons in antiferromagnetic insulators into itinerant carriers in a metal, where magnetism is preserved in the form of strong correlations. The absence of this transition in Fe-based superconductors may limit their T(c)s, but even larger T(c)s may be possible in their isostructural Mn analogs, which are antiferromagnetic insulators like the cuprates. It is generally believed that prohibitively large pressures would be required to suppress the effects of the strong Hund's rule coupling in these Mn-based compounds, collapsing the insulating gap and enabling superconductivity. Indeed, no Mn-based compounds are known to be superconductors. The electronic structure calculations and X-ray diffraction measurements presented here challenge these long held beliefs, finding that only modest pressures are required to transform LaMnPO, isostructural to superconducting host LaFeAsO, from an antiferromagnetic insulator to a metallic antiferromagnet, where the Mn moment vanishes in a second pressure-driven transition. Proximity to these charge and moment delocalization transitions in LaMnPO results in a highly correlated metallic state, the familiar breeding ground of superconductivity.

52 citations

Journal ArticleDOI
TL;DR: This work finds that key features of the T=0 phase diagram, such as critical doping for SC-AFM coexistence and the maximum value of the SC order parameter, are determined by a single parameter eta which characterizes the topology of the "Fermi surface" at half filling defined by the bare tight-binding parameters.
Abstract: We investigate the asymmetry between electron and hole doping in a 2D Mott insulator and the resulting competition between antiferromagnetism (AFM) and d-wave superconductivity (SC), using variational Monte Carlo calculations for projected wave functions. We find that key features of the T=0 phase diagram, such as critical doping for SC-AFM coexistence and the maximum value of the SC order parameter, are determined by a single parameter eta which characterizes the topology of the "Fermi surface" at half filling defined by the bare tight-binding parameters. Our results give insight into why AFM wins for electron doping, while SC is dominant on the hole-doped side. We also suggest using band structure engineering to control the eta parameter for enhancing SC.

52 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202258
202169
202084
201987
201883