Researchers have solved a mystery that has confounded scientists for 80 years: the crystal structure of the ...

Magnetic helium makes superfluid time crystal Researchers observe time crystal and quasicrystal, throw in supersolid for fun.

Everyone's excited about a compound formed with helium, one of the periodic table's most inert elements. But this work has been under scrutiny for three years, and not everyone's convinced.

At high pressures, Na 2 He forms a stable compound with a three-dimensional checkerboard-like structure. Sodiums are the purple spheres, heliums are the green cubes, and electrons are the red regions.

In this latest work, Yanming Ma of Jilin University, Changfeng Chen of the University of Nevada and colleagues in the US, China and the UK used a search algorithm to look for iron- or magnesium-based ...

Crystal structure of Na₂He, which resembles a 3D checkerboard. The purple spheres represent sodium atoms, which are inside the green cubes that represent helium atoms.

Their structure is exactly analogous to that of the hydrogen bands given by Richardson and Davidson (Proc. Roy. Soc., A, 123, 54, 466, A, 124, 50, 69), as will be best apparent from a description ...