A superglass is a

phase of matter In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a ...

which is characterized by

superfluid Superfluidity is the characteristic property of a fluid with zero viscosity which therefore flows without any loss of kinetic energy. When stirred, a superfluid forms vortex, vortices that continue to rotate indefinitely. Superfluidity occurs ...

ity and a frozen

amorphous In condensed matter physics and materials science, an amorphous solid (or non-crystalline solid) is a solid that lacks the long-range order that is a characteristic of a crystal. The terms "glass" and "glassy solid" are sometimes used synonymousl ...

structure at the same time. J.C. Séamus Davis theorised that frozen

helium-4 Helium-4 () is a stable isotope of the element helium. It is by far the more abundant of the two naturally occurring isotopes of helium, making up about 99.99986% of the helium on Earth. Its nucleus is identical to an alpha particle, and consi ...

(at 0.2 K and 50 atm) may be a superglass.

Notes

References

Superglass could be new state of matter
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A new quantum glass phase: the superglassPhys. Rev. Lett. Vol.101, 8th Aug 2008
Superfluidity Phases of matter Glass physics {{physics-stub