There is much talking in recent days about solid metallic hydrogen and its possible uses. When was it referenced in a science fiction story for the first time? Please note that I am asking about its use as a tool.

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    Some say there was an article about the fictional discovery of metallic hydrogen recently in Science. ;) – Adamant Jan 30 '17 at 10:30
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    I seem to recall that the Moties in The Mote in Gods Eye were apparently refueling a ship with metallic hydrogen shipped by a linear accelerator. Can't make it an answer, because I no longer have the book to check – infixed Jan 30 '17 at 15:43
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    @infixed: The Mote In God's Eye, Ch. 19: Renner was new to the Navy, but he was learning to recognize that tone. “Yessir. It occurred to me that hydrogen is metallic at the right temperature and pressure. If those tanks were really pressurized, the hydrogen would carry a current—but it would take the kind of pressures you find at the core of a gas giant planet.” – Joe L. Jan 30 '17 at 16:34
  • @JoeL You did the leg work, you can take the answer if you want. I don't even remember the year that came out – infixed Jan 30 '17 at 16:43
  • @infixed: It may not count since it was only a speculation that is never "proven" in the book. – Joe L. Jan 30 '17 at 16:57

Poul Anderson's Call Me Joe (1957) includes a reference to a level on Jupiter "where water ids a heavy mineral and Hydrogen is a metal". The speaker is told that Hydrogen is still a gas where Joe lives, and that the metallic phase is lower down.

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