Phys. Rev. Lett. 89, 095301 (2002) [4 pages]Interaction of First and Second Sound in Solid 4He: Properties of a Possible Bose CondensateReceived 31 January 2002; published 9 August 2002 A previous experiment in this laboratory found that the addition of a few tens of parts per 106 of 3He impurities to solid 4He crystals resulted in a phase transition below 200 mK. In the experiment described here the interaction of acoustic waves with waves generated by heat pulses is measured and shows that there is an energy gap in the excitations of the high temperature phase and that coherent waves are carried by nonphonon excitations at the lowest temperatures. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.095301
DOI:
10.1103/PhysRevLett.89.095301
PACS:
67.80.–s, 05.30.Fk, 05.30.Jp, 05.70.Fh
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.