Shaking down frozen helium: In a 'supersolid' state, it has liquid-like characteristics

ScienceDaily (May 12, 2011) — In a four-decade, Holy Grail-like quest to fully understand what it means to be in a "supersolid" state, physicists have found that supersolid isn't always super solid. In other words, this exotic state of frozen helium appears to have liquid-like properties, says a new paper published in the journal Science.

Why is this important? Understanding supersolid helium brings us closer to understanding its close cousins superconductivity and superfluidity.

Physicists had long thought that the unusual behavior of torsion oscillators containing solid helium meant that chilling helium down to temperatures near absolute zero prompts its transformation into a supersolid. It is certainly solid, but in this physical quest, there was a nagging question: Is it a true supersolid?

To gain new perspectives on solid helium, new research tools were needed. "Think of this analogy: when Galileo first peered through a telescope, he saw ears on Saturn. With improved technology, humanity began to understand those ears were actually rings around the planet. And with better technology, we saw the differences in the rings. To further understand solid helium, science had to invent new approaches," says Séamus Davis, Cornell professor of physics. "Helium is a pure material. We're gaining a new understanding of the fundamental issues of how nature works, of how the universe works."

In fact, in this paper, the researchers show instead a more prosaic explanation: There are moving defects in the solid helium crystals, and their relaxation time falls with rising temperatures. This is more consistent with the torsional oscillation (shaking) experiments conducted at Cornell.

The researchers learned that the unusual properties of solid helium do not reflect a clunky transition between the solid state and a supersolid state. It behaves like a dimmer switch and presents a smooth transition near absolute zero.

Funding for this research: the National Science Foundation and the Kavli Institute for Theoretical Physics. Research at Los Alamos was supported by U.S. Department of Energy, through the Laboratory Directed Research and Development program.

Story Source:

The above story is reprinted (with editorial adaptations by ScienceDaily staff) from materials provided by Cornell University, via EurekAlert!, a service of AAAS.

Journal Reference:

E. J. Pratt, B. Hunt, V. Gadagkar, M. Yamashita, M. J. Graf, A. V. Balatsky, and J. C. Davis. Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He. Science, 13 May 2011: Vol. 332 no. 6031 pp. 821-824 DOI: 10.1126/science.1203080

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