Microdrops of superfluid.(superfluidity in cooled liquid helium)(Brief Article) Science News | April 25, 1998| | COPYRIGHT 1998 Science Service, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright

Liquid helium cooled to temperatures lower than 2.12 kelvins can become a superfluid, flowing without friction. Now, researchers have shown experimentally that superfluidity can occur in a cluster consisting of as few as 60 helium-4 atoms. J. Peter Toennies and his colleagues at the Max Planck Institute in Gottingen, Germany, report their findings in the March 27 Science.

The scientists studied the rotation of a single molecule of oxygen carbon sulfide (OCS) inside a tiny droplet of helium-3 at a temperature at which helium-4 is a superfluid but helium-3 is not. ...

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