The uniform theory explains that there are two characteristics of frustrated magnets


Left panels: spin (atomic magnet) configurations (bottom panel) and violation (top panel) conservation law. Right panels: Neutron scattering on two situations: 3D structure of the neutron scatter sample (middle panel) and pinch point (bottom panel) and semi-moon (upper panel) constant energy cross. Two patterns correspond to the two spin configuration left. Credit: The Quantum Matter Unit Theory

For the first time, physicists are a unique theory that reflects the two distinct characteristics of frustrated magnets and why they come together.


When physicists send neutrons that are frustrated by the magnet, the particles sign the signature samples in the other part of the copper. Designs appear, because even at low temperatures, the atoms are frustrated iron oscillate at each other. One distinguished pattern known as "pinch point", is like a bow tie and is widely studied in the world of spin fluids. Pinch count is often accompanied by a mysterious crescent samples called "Half Moon", but physics connects the events never explained.

Now, researchers from Okinawa Institute of Science and Technology (OIST) have discovered that the pinch points and the half moon are the same – just the same physics signatures on different energy levels. Their unified theory, published on October 12, 2018 Physical Review B. Fast communication is the first to explain that the underlying physics often performs a phenomenon.

"The theory itself is simple," says Han Yan, a graduate of OIST's theory of quantum issues and the first author of the research. "The same theory that gives you a lower energy point can calculate what's going on with high energy and you get half of the pair.

If you have hit a magnetic magnet near each of the atomic material, it seems that these atoms are in a beautifully coordinated dance with each other so that their magic can be lifted in the final. This ballet is difficult to follow directly, so instead of physicists looking for intelligence expressions that the performance is going on.

An experimental technique called neutron scattering allows scientists to collect these assemblies. Neutrons do not have electric charge, but they act as a source of magnetism. Individual atoms will also act as small magnets that are in their north and south poles. When the material is transmitted by neutron speed and direction, it passes by atoms, which is "scattered".

The sample scattered tells physicists how the atoms are inside the material. For example, if the neutron scatter is scattering, the physicists indicate that the atoms in substances start randomly. If neutrons scatter in a bold-tie, they indicate that the atoms are twirling in tandem as they are frustrated magnet.

Pinch points will appear when the equal number of atomic magnets, or "spins," indicates "out" as pointing to "in" any region disappointed magnet. This equilibrium is inherent in material and keeps it as minimal energy.

Half Moon will appear when the frustrated Magnetite energy is beyond this minimum level and therefore violates the law of local conservation, which envisages an equal number of waves as essentially half the moon curve points. The more variable, the stronger the violation, the more energy the system uses. OIST researchers have discovered this relationship with their calculations and later tested it.

The researchers examined their unified theory in a simulated system where the pinch score and the half moon can be noted together, known as the Heisenberg antiferro-magnet on kagome lattice. They also used equations for recent magnet observations of the Magnets Nd2Zr2O7 and found that their theory was to explain two samples of the application.

"Pinch Point and Half Moon come with the same underlying physics-one of the local conservation conservation laws and other violations," said Yan. "When they are together, they create the whole picture of common phenomenology."

In the future, a single theory of half-moon and pinpoint points is useful in theoretical and applied physics, and maybe beyond.

"In some sense, each condensed material system is a different world," said Jan. "It's a great intellectual curiosity to find this world, with its own strange laws, but it's about everyday people trying to reveal the most useful laws in this mini-world, so we can use them to our advantage."


Learn further:
Spiral fluid peak

Მet Information:
Han Yani and others. Half Moon is a dispenser, Physical Review B. (2018). DOI: 10.1103 / PhysRevB.98.140402

Journal Reference:
Physical Review B.

Provided by:
Okinava Institute of Science and Technology