The ongoing experimental and theoretical effort aimed at understanding nonclassical
rotational inertia in solid helium has sparked renewed interest in the supersolid phase of …

We have confirmed the existence, as first reported by Kim and Chan, of a supersolid state in
solid He 4 at temperatures below 250 mK. We have employed a torsional oscillator cell with …

For nearly half a century the supersolid phase of matter has remained mysterious, not only
eluding experimental observation, but also generating a great deal of controversy among …

A decrease in the rotational period observed in torsional oscillator measurements was
recently taken as a possible indication of a putative supersolid state of helium. We …

We have investigated the influence of impurities on the possible supersolid transition in He 4
by systematically enriching isotopically pure samples with He 3. The addition of He 3 …

A'supersolid'is a quantum solid in which a fraction of the mass is superfluid. As a remarkable
consequence, it is rigid, but part of its mass is able to flow owing to quantum physical …

We report torsional oscillator supersolid studies of highly disordered samples of solid He 4.
In an attempt to approach the amorphous or glassy state of the solid, we prepare our …

Here we provide an overview of the status of the field of solid 4 He with a focus on the recent
theoretical and experimental activities stimulated by the 2004 experiments of Kim and Chan …

The supersolid state of matter, exhibiting nondissipative flow in solids, has been elusive for
35 years. The recent discovery of a nonclassical moment of inertia in solid He 4 by Kim and …

Supersolid states simultaneously feature properties typically associated with a solid and with
a superfluid. Like a solid, they possess crystalline order, manifesting as a periodic …