Crystalline structure of the Ca-VII superconducting phase of calcium.

From the article:

Ca-VII: A Chain Ordered Host-Guest Structure of Calcium above 210 GPa
Hiroshi Fujihisa, Yuki Nakamoto, Masafumi Sakata, Katsuya Shimizu, Takahiro Matsuoka, Yasuo Ohishi, Hiroshi Yamawaki, Satoshi Takeya, and Yoshito Gotoh
Phys. Rev. Lett. 110, 235501 (2013)

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