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SUMMARY:Two new vortex liquids - Wittaya Kanchanapusakit
DTSTART:20080523T150000Z
DTEND:20080523T153000Z
UID:TALK11679@talks.cam.ac.uk
CONTACT:James Kermode
DESCRIPTION:"Two new vortex liquids"\nPhilip W Anderson\n"Nature Physics 3
 \, 160-162 (2007)":http://www.nature.com/nphys/journal/v3/n3/abs/nphys539.
 html\n\nIn 1967\, Reatto and Chester proposed that solid helium-4 might ex
 hibit superfluidity\, and in 1970\, Leggett suggested what was thought to 
 be a definitive experimental test: to find non-classical rotational inerti
 a in a toroidal sample. More than three decades later\, the observation by
  Kim and Chan\, 4 of exactly that effect generated great interest and has 
 been repeated and confirmed by a number of groups. However\, many attempts
  to find actual superflow in truly solid samples have failed. Here\, I dra
 w an analogy with a second example of anomalous response to vorticity in a
  dissipative fluid\, the vortex liquid phase in the pseudogap region of hi
 gh-temperature superconductors\, and propose that the solid helium experim
 ents have been mischaracterized: what is observed is not supersolidity but
  an incompressible vortex liquid. This state is distinct from a convention
 al liquid in that its properties are dominated by conserved supercurrents 
 flowing around a thermally fluctuating tangle of vortices.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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