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- W2078221824 abstract "The heat capacity of the single crystalline electride of ${(mathrm{Ca}mathrm{O})}_{12}{({mathrm{Al}}_{2}{mathrm{O}}_{3})}_{7}:{e}^{ensuremath{-}}$ $(mathrm{C}12mathrm{A}7:{e}^{ensuremath{-}})$ with ${T}_{c}=0.2phantom{rule{0.3em}{0ex}}mathrm{K}$ was larger than that of electron-undoped C12A7 in the temperature range $0.085--5phantom{rule{0.3em}{0ex}}mathrm{K}$, reflecting the metallic nature of the electride. A superconducting transition was detected as a heat capacity jump $ensuremath{Delta}{C}_{p}=3.4phantom{rule{0.3em}{0ex}}mathrm{mJ}phantom{rule{0.2em}{0ex}}{mathrm{mol}}^{ensuremath{-}1}phantom{rule{0.2em}{0ex}}{mathrm{K}}^{ensuremath{-}1}$, and the profile and magnitude of $ensuremath{Delta}{C}_{p}$ agreed well with those expected from the BCS theory. The electron-phonon coupling constant $(ensuremath{lambda}ensuremath{sim}0.46)$ and Debye temperature $({ensuremath{Theta}}_{D}ensuremath{sim}630phantom{rule{0.3em}{0ex}}mathrm{K})$ were much larger than those for alkali metals having $s$-like conduction electrons as in the present electride, suggesting that electrides having a rigid structure will be a class of BCS superconductors." @default.
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- W2078221824 date "2008-03-12" @default.
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- W2078221824 title "Evidence for Bardeen-Cooper-Schrieffer-type superconducting behavior in the electride<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant=normal>Ca</mml:mi><mml:mi mathvariant=normal>O</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>12</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi mathvariant=normal>Al</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant=normal…" @default.
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- W2078221824 doi "https://doi.org/10.1103/physrevb.77.092505" @default.
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