The transparent, chargeless quasiparticle could shed more light on the underlying mechanics of superconductivity
."In fact, we weren't even looking for it. But it turned out we were doing exactly the right thing, and we found it."
David Pines first conceived of his demon in 1956, predicting it would emerge inside certain metals when two sets ofat different energy bands form two plasmons. If these plasmons fell out of phase with each other, such that the peaks of one line up with the valleys of the other, they could partially cancel out.
Usually, very specific temperatures are required to form one plasmon across an entire material, but Pines argued that his new combined plasmon, being massless, neutral and taking its components from a mix of energies, could exist at room temperatures. He named his theoretical particle, which has a"distinct electron motion," a demon. But its lack of mass and charge has made it difficult to find.
To hunt the demon, physicists behind the new study fired electrons at crystallized strontium ruthenate and measured their energies as the electrons bounced back. From this they calculated the momentum of the plasma wave inside the material.
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