Semi-conductor name / material

That's fascinating Europium!!

I must drop that in to a conversation sometime

John.

Isn't "zero entropy" equivalent to "infinite energy" in compliance to the second law?

There is an interesting article about the supersolid state of He₄ in the May 2007 edition of Physics World .

Yttrium barium copper oxide

Hello JohnV,

Guest asked, "What is the name [of], or of what material composition is the element that has almost zero friction when introduced into a subzero Helium liquid or gas environment?"

YBCO is a high-temperature superconductor. YBCO does not exhibit properties of a supersolid nor a superfluid when in the superconducting state. These properties manifest only when an appreciable fraction of an element constitutes a Bose-Einstein Condensate. The formation of BECs become possible only at the ultra-low temperatures at which constituent atoms of the material can persist in the quantum ground state.

OK.

This is well beyond my knowledge.

I do remember seeing a photo of liquid helium climbing up the walls of the container. What a strange substance.

I am strictly a layman in a discussion of this topic, having not looked into the physics, etc of cryogenic materials (especially Helium) for ~40 years. I am wondering if you would be so kind as to explain from a physical standpoint how these strange behaviors occur. This is actually the first I've heard of Helium in a solid state.