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Flocking Together, Flying Solo

Much like a flock of birds in motion need to know what their neighbors are doing, electrons and magnetic moments in a solid need to interact if they are to successfully order or arrange themselves into a new state.  If one or two birds are missing, the unit can still function, but if too many are removed, it becomes hard to coordinate the flock.  Studying a magnetic compound containing cerium, scientists found that the magnetism on cerium is like rare birds that can fly as part of a flock even when most of the group is gone.  Researchers found that they could remove between 80 and 95% of t

Precise Rulers for Measuring Light

A team of researchers has developed a model that calculates how to create light rulers—known in science speak as frequency combs—from a nearly single frequency of light using graphene.  Graphene’s conductivity varies with time when responding to electromagnetic pulses, opening up the possibility to manipulate the pulses and create highly tunable light rulers.  The team showed if a beam of light is transmitted through graphene while tweaking the material’s conductivity (how much electricity the material can transmit) it creates a spectrum of light with evenly distributed peaks that function

Molecular Manipulations of Symmetry

Researchers have studied the effect of concentration on the activity and selectivity in a zirconium-catalyzed hydroamination reaction.  In this important reaction for the efficient and atom economical synthesis of valuable amine compounds, the nitrogen-hydrogen bond adds across a carbon double bond to give a new nitrogen-carbon bond.  Varying concentrations allows for the systematic tuning of a homogeneous 3D environment, impacting the selectivity.

Perpendicular Magnetism Unparalleled Find in Single Crystal

Two distinct types of magnetism aligned perpendicular in a single crystal have been detailed in new measurements on single-crystal and powered samples composed of barium, potassium, manganese, and arsenic.  Antiferromagnetism occurs with a checkerboard-style patterning of the total atomic magnetic moments due to the spins of the localized electrons of the manganese atoms (known as ‘local-moment magnetism’).  Aligning perpendicular to the antiferromagnetic order, ferromagnetism (where all electron spins point in the same direction) also occurs, but is assigned specifically to the mobile cha

Hard or Soft Shell? It’s Not Just a Taco Question

Swapping out hard-shelled nanoparticle models for the soft-shelled variety has led to theoretical results in tune with experimental findings for building supercrystal nano materials. These are fundamental new type of material that are built from nanoparticles displaying long range order. In the process of building, the nanoparticles interact, jockeying for position in the lattice. Whereas models of hard-shelled nanoparticles only clink against each other, the flexible exterior of soft-shelled nanoparticles makes their interactions much more complex.

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