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- W2027747436 abstract "Measurements of the critical field $stackrel{^}{H}$ and transition temperature $stackrel{^}{T}$ of superconducting indium in porous glass have been made using a low-frequency mutual-inductance technique. The pore sizes of the glasses are well characterized, so that 96% of the pore volume is within ifmmodepmelsetextpmfi{}10% of the mean pore diameter $d$. Pore diameters from 65 to 250 AA{} were used. Below $t (ensuremath{equiv}frac{T}{stackrel{^}{T}})=0.5$, $stackrel{^}{H}$ can be represented approximately by $stackrel{^}{H}=frac{(3415ifmmodepmelsetextpmfi{}40)(1ensuremath{-}{t}^{2})}{{d}^{(1.00ifmmodepmelsetextpmfi{}0.14)}},$where $stackrel{^}{H}$ is in kilo-oersteds and $d$ is in Angstrom units. This is in agreement with the predictions of de Gennes and Maki of ${H}_{c2}$ for type II superconductors in the dirty limit, assuming that the electronic mean free path is proportional to $d$. Above $t=0.6$, there are deviations from de Gennes's prediction for the $d$ dependence and the $t$ dependence of $stackrel{^}{H}$. For the small pore sizes the temperature dependence of $stackrel{^}{H}$ is qualitatively similar to the Abrikosov prediction of ${H}_{c2}$ for type II superconductors; however, near $t=1$ for the largest pore size the temperature dependence of $stackrel{^}{H}$ is similar to that for a type I superconductor. The superconducting transition temperature $stackrel{^}{T}$ shows a strong dependence upon $d$, so that $stackrel{^}{T}(65 AA{})$ is 4.23ifmmode^circelsetextdegreefi{}K compared with 3.4ifmmode^circelsetextdegreefi{}K for the bulk indium. The dependence of $stackrel{^}{T}$ on $d$ is conveniently represented by $stackrel{^}{T}ensuremath{-}{T}_{mathrm{bulk}}=1ensuremath{-}0.0028 d,$where $d$ is in Angstrom units. The change in $stackrel{^}{T}$ may be due to strain, mean-free-path, or surface effects. The samples are similar to inhomogeneous type II superconductors in their magnetic properties, showing hysteresis and flux jumping." @default.
- W2027747436 created "2016-06-24" @default.
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- W2027747436 date "1966-08-05" @default.
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- W2027747436 title "Critical Magnetic Field and Transition Temperature of Synthetic High-Field Superconductors" @default.
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- W2027747436 doi "https://doi.org/10.1103/physrev.148.223" @default.
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