Using a diamond-anvil cell with nearly hydrostatic helium pressure medium, we have significantly extended the superconducting phase diagram T-c(P) of Sc, the lightest of all transition metals. We find that superconductivity is induced in Sc under pressure, T-c increasing monotonically to 8.2 K at 74.2 GPa. The T-c(P) dependences of the trivalent d-electron metals Sc, Y, La, and Lu are compared and discussed within a simple s -> d charge transfer framework.
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