The Experts below are selected from a list of 24 Experts worldwide ranked by ideXlab platform
L D Cooley - One of the best experts on this subject based on the ideXlab platform.
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influence of screening on the Superconductive Transition Temperature
Physical Review B, 2003Co-Authors: R J Soulen, M S Osofsky, L D CooleyAbstract:We extend the Morel-Anderson model, originally developed to account for the Superconductive Transition Temperature, ${T}_{c},$ of the elements, so that it accounts for the complete phase line for ${T}_{c}$ of disordered systems over the full range of metallic behavior, from the pure metal to the extinction of the metallic state at the metal-insulator Transition. The cornerstone of this model is the calculation of the BCS interaction potential, V, and the single-particle density of states, N, using the Landau theory for interacting fermions evaluated with a screened Coulomb interaction potential. Thus, an interpolation is established between Fermi liquid behavior and the critical regime where disorder and Coulomb interactions define the metal-insulator Transition. Experimental values for ${T}_{c},$ N, and V were compared with these predictions and the agreement was excellent. Furthermore, since the model is expressed entirely in terms of parameters that may be calculated or measured, it has predictive powers that may prove useful in the search for $\mathrm{h}\mathrm{i}\mathrm{g}\mathrm{h}\ensuremath{-}{T}_{c}$ materials.
R J Soulen - One of the best experts on this subject based on the ideXlab platform.
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influence of screening on the Superconductive Transition Temperature
Physical Review B, 2003Co-Authors: R J Soulen, M S Osofsky, L D CooleyAbstract:We extend the Morel-Anderson model, originally developed to account for the Superconductive Transition Temperature, ${T}_{c},$ of the elements, so that it accounts for the complete phase line for ${T}_{c}$ of disordered systems over the full range of metallic behavior, from the pure metal to the extinction of the metallic state at the metal-insulator Transition. The cornerstone of this model is the calculation of the BCS interaction potential, V, and the single-particle density of states, N, using the Landau theory for interacting fermions evaluated with a screened Coulomb interaction potential. Thus, an interpolation is established between Fermi liquid behavior and the critical regime where disorder and Coulomb interactions define the metal-insulator Transition. Experimental values for ${T}_{c},$ N, and V were compared with these predictions and the agreement was excellent. Furthermore, since the model is expressed entirely in terms of parameters that may be calculated or measured, it has predictive powers that may prove useful in the search for $\mathrm{h}\mathrm{i}\mathrm{g}\mathrm{h}\ensuremath{-}{T}_{c}$ materials.
Yuh Shiohara - One of the best experts on this subject based on the ideXlab platform.
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fabrication of single crystal of smba2cu3o7 x by the modified top seeded solution growth method in low oxygen partial pressure atmosphere
Japanese Journal of Applied Physics, 1995Co-Authors: Masaru Nakamura, Christian Krauns, Yuh ShioharaAbstract:Single crystals of SmBa2Cu3O7-x (Sm123) have been successfully grown by a modified top-seeded solution growth (TSSG) method in 1% oxygen partial pressure atmosphere ( P(O2)=0.01 atm). Solid Sm2BaCuO5 (Sm211) solute and Ba-Cu-O solvent with Ba to Cu ratio of 3:5 were used in a Sm2O3 crucible. The Sm123 as-grown crystals were confirmed by X-ray structure analysis to have the SmBa2Cu3O7-x tetragonal structure, and the substitution of Sm ion to the Ba site was not detected within experimental accuracy. The transport properties of the grown crystals annealed in an oxygen gas flow were measured by the direct-current four-contact method, both in the ab-plane and along the c-axis. The Superconductive Transition Temperature was 93 K and the Transition width was 0.3 K.
M S Osofsky - One of the best experts on this subject based on the ideXlab platform.
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influence of screening on the Superconductive Transition Temperature
Physical Review B, 2003Co-Authors: R J Soulen, M S Osofsky, L D CooleyAbstract:We extend the Morel-Anderson model, originally developed to account for the Superconductive Transition Temperature, ${T}_{c},$ of the elements, so that it accounts for the complete phase line for ${T}_{c}$ of disordered systems over the full range of metallic behavior, from the pure metal to the extinction of the metallic state at the metal-insulator Transition. The cornerstone of this model is the calculation of the BCS interaction potential, V, and the single-particle density of states, N, using the Landau theory for interacting fermions evaluated with a screened Coulomb interaction potential. Thus, an interpolation is established between Fermi liquid behavior and the critical regime where disorder and Coulomb interactions define the metal-insulator Transition. Experimental values for ${T}_{c},$ N, and V were compared with these predictions and the agreement was excellent. Furthermore, since the model is expressed entirely in terms of parameters that may be calculated or measured, it has predictive powers that may prove useful in the search for $\mathrm{h}\mathrm{i}\mathrm{g}\mathrm{h}\ensuremath{-}{T}_{c}$ materials.
Masaru Nakamura - One of the best experts on this subject based on the ideXlab platform.
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fabrication of single crystal of smba2cu3o7 x by the modified top seeded solution growth method in low oxygen partial pressure atmosphere
Japanese Journal of Applied Physics, 1995Co-Authors: Masaru Nakamura, Christian Krauns, Yuh ShioharaAbstract:Single crystals of SmBa2Cu3O7-x (Sm123) have been successfully grown by a modified top-seeded solution growth (TSSG) method in 1% oxygen partial pressure atmosphere ( P(O2)=0.01 atm). Solid Sm2BaCuO5 (Sm211) solute and Ba-Cu-O solvent with Ba to Cu ratio of 3:5 were used in a Sm2O3 crucible. The Sm123 as-grown crystals were confirmed by X-ray structure analysis to have the SmBa2Cu3O7-x tetragonal structure, and the substitution of Sm ion to the Ba site was not detected within experimental accuracy. The transport properties of the grown crystals annealed in an oxygen gas flow were measured by the direct-current four-contact method, both in the ab-plane and along the c-axis. The Superconductive Transition Temperature was 93 K and the Transition width was 0.3 K.