The magnetic structure of FePS3
Posted on 02/09/2021 3:13:16 PM PST by BenLurkin
The researchers, led by the University of Cambridge, were able to control the conductivity and magnetism of iron thiophosphate (FePS3), a two-dimensional material which undergoes a transition from an insulator to a metal when compressed. This class of magnetic materials offers new routes to understanding the physics of new magnetic states and superconductivity.
Using new high-pressure techniques, the researchers have shown what happens to magnetic graphene during the transition from insulator to conductor and into its unconventional metallic state, realized only under ultra-high pressure conditions. When the material becomes metallic, it remains magnetic, which is contrary to previous results and provides clues as to how the electrical conduction in the metallic phase works. The newly discovered high-pressure magnetic phase likely forms a precursor to superconductivity so understanding its mechanisms is vital.
The researchers used new techniques to measure the magnetic structure up to record-breaking high pressures, using specially designed diamond anvils and neutrons to act as the probe of magnetism. They were then able to follow the evolution of the magnetism into the metallic state.
(Excerpt) Read more at phys.org ...
Thanks for posting!
The idea of “two-dimensional matter” is foreign to me.
“...using specially designed diamond anvils and neutrons to act as the probe of magnetism.”
I was just doing this at my apartment today...
Graphene is a zero-gap semiconductor, because its conduction and valence bands meet at the Dirac points. The Dirac points are six locations in momentum space, on the edge of the Brillouin zone, divided into two non-equivalent sets of three points. The two sets are labeled K and K’. The sets give graphene a valley degeneracy of gv = 2. By contrast, for traditional semiconductors the primary point of interest is generally Γ, where momentum is zero. Four electronic properties separate it from other condensed matter systems.
“The idea of “two-dimensional matter” is foreign to me.”
Graphine is a single atom thick, and I’ve seen people referring to it as two-dimensional, but even a single atom is three-dimensional, isn’t it?
Well...that’s good, because it isn’t two dimensional. One atom of height, variable length and width. That’s three dimensions.
“but even a single atom is three-dimensional, isn’t it?”
Not really. If the “height” is one atom high then that dimension is so small to be almost negligible. For practical purposes it is two dimensional.
Just a brain puzzler question:
Aren’t the only things that’s truly two dimensional light and shadows?
Correct! Any material thing that occupies space has 3 dimensions. It just seemed incongruous for a learned article to use “two-dimensional” when referring to this material.
I always thought light consisted of propagating electromagnetic fields without any Dimensions at all except for radiation that can exhibit particle wave duality depending how it’s measured while still not registering volume.
Technically that picture is two dimensional. Although it wouldn’t seem so with all those curves... (!)
Sorry.
On my second martini, and am still fuming about how Marvel ruined the Tesseract.
(The mathematical depiction of the shadow of a fourth dimensional cube)
Im inventing a monopole magnet and AC battery. I’ll be rich I tells yah.
Thanks so much for clearing that up.
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