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Re:Physicists Have Identified a Metal That Conducts Electric... by brennanpeterson on Sunday December 01, 2019 @01:41PM (#21677037)
Electrical conductivity is electron motion, and if you have electrons to carry charge, you also get thermal conductivity. So metals (in the general sense) are good electrical and thermal conductors.

If you have very hard materials, with high phonon conduction, you can get thermal transport via phonons. But, these are almost all poor electrical conductors, as you need very tight binding to get hard materials with high phonon velocity.

The prototypical example of the second case is diamond.

Re:Physicists Have Identified a Metal That Conducts Electric... by neltnerb on Sunday December 01, 2019 @02:20PM (#21677264)
Oh yeah, fair. Good explanation. The relationship is one directional because there are other ways to carry heat.