http://physicsworld.com/cws/article/news/2014/jun/12/using-magnetic-cooling-for-green-refrigeration

_Very_ interesting article with respect to Traveller TL11+ heat sinking.

"Such devices take advantage of the magnetocaloric effect – a
phenomenon in which certain materials change temperature in response
to an externally applied magnetic field. Such fields cause the
magnetic dipoles of the atoms within magnetocaloric compounds to
align. To balance out this decrease in entropy – and thereby satisfy
the second law of thermodynamics – the motion of the atoms also
becomes more disordered, and the material heats up. In contrast, when
the applied field is removed, the process reverses and the material
cools"

If you've got the ability to make room temp superconductors, I can see
them developing highly super-magnetocaloric materials.
You'd let the material heat up (ie, lots of molecular motion) and then
push electric current through it, and lock the molecules in place,
thus making heat "stop"