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首页> 外文期刊>Physical review, B. Condensed matter and materials physics >Effects of Co substitution on thermodynamic and transport properties and anisotropic H-c2 in Ba(Fe1-xCox)(2)As-2 single crystals
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Effects of Co substitution on thermodynamic and transport properties and anisotropic H-c2 in Ba(Fe1-xCox)(2)As-2 single crystals

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摘要

Single crystalline samples of Ba(Fe1-xCox)(2)As-2 with x = 0.038 superconductivity is stabilized, rising to a maximum T-c of approximately 23 K for x approximate to 0.07 and decreasing for higher x values. The T-x phase diagram for Ba(Fe1-xCox)(2)As-2 indicates that either superconductivity can exist in both low-temperature crystallographic phases or that there is a structural phase separation. Anisotropic superconducting upper critical-field data H-c2(T) show a significant and clear change in anisotropy between samples that have higher temperature structural phase transitions and those that do not. These data show that the superconductivity is sensitive to the suppression of the higher temperature phase transition.

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