Rotons, superfluidity, and He crystals Laszlo Tisza, june 17, 2005
Yüklə 445 b.
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 Rotons, superfluidity, and He crystalsLaszlo Tisza, june 17, 2005 Outline Looking back to the history of superfluidity P. Kapitza rediscovers superleaks and introduces the word « superfluid », in analogy with « superconductor » 5 march 1938, Institut Henri Poincaré (Paris) : Fritz London: superfluidity has to be connected with Bose-Einstein condensation Paris 1938: Laszlo Tisza introduces the « two-fluid model » Lev D. Landau Moscow 1941 - 47 The London-Tisza-Landau controversy BEC in 4He neutron scattering: rotons exist rotons : a consequence of local order Quantum evaporation The surface of helium crystals the roughening transitions roughening transitions in He 4 the universal relation up to 11 different facets on helium 3 crystals quantum fluctuations and coupling strength in 3He up to 60 different facets in liquid crystals 3He crystals at 320 mK: coalescence without viscosity Crystallization waves melting and freezing surface stiffness measurements the metastability limits of liquid He high amplitude acoustic waves The tensile strength of liquid helium F. Caupin , S. Balibar et al. see Phys. Rev. B 64, 064507 (2001) and J. Low Temp. Phys. 129, 363 (2002) acoustic cristallization on a glass wall X. Chavanne, S. Balibar and F. Caupin Phys. Rev. Lett. 86, 5506 (2001) the extended phase diagram of liquid 4He R. Ishiguro, F. Caupin and S. Balibar, LT24 Possible observation of homogeneous crystallization Intensity and time delay with many thanks to the co-authors of my papers: students, postdocs, visitors, hosts and collaborators (chronological order)   Dripping of helium 3 crystals Yüklə 445 b. Dostları ilə paylaş:
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