Ca-VII: a chain ordered host-guest structure of calcium above 210 GPa

The recently discovered high pressure phase VII of calcium [M. Sakata et al., Phys. Rev. B 83, 220512(R) (2011)] has the highest superconducting transition temperature (T(c)) of 29 K among all the elements. Understanding the cause for such a high T(c) state is necessary to clarify its crystal struct...

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Published in:Physical review letters 2013-06, Vol.110 (23), p.235501-235501, Article 235501
Main Authors: Fujihisa, Hiroshi, Nakamoto, Yuki, Sakata, Masafumi, Shimizu, Katsuya, Matsuoka, Takahiro, Ohishi, Yasuo, Yamawaki, Hiroshi, Takeya, Satoshi, Gotoh, Yoshito
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creator Fujihisa, Hiroshi
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description The recently discovered high pressure phase VII of calcium [M. Sakata et al., Phys. Rev. B 83, 220512(R) (2011)] has the highest superconducting transition temperature (T(c)) of 29 K among all the elements. Understanding the cause for such a high T(c) state is necessary to clarify its crystal structure. The structure of this phase was determined by an x-ray powder diffraction experiment and a density functional theory calculation and was not found to be the usual host-guest type but consisted of a 2×2 supercell in the tetragonal ab plane with a commensurate host-guest ratio of 4/3 along the c axis containing 128 atoms.
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title Ca-VII: a chain ordered host-guest structure of calcium above 210 GPa
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