caa a22 4500 445365641 CHVBK 20180317142929.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10909-010-0306-0 doi (NATIONALLICENCE)springer-10.1007/s10909-010-0306-0 Giant Coupling Effects in Confined 4He Near T λ [Elektronische Daten] [J. Perron, F. Gasparini] Superfluid 4He shares with superconductors a transition into a low temperature state where the order parameter is a wave function. For the low temperature superconductors, which have a large zero temperature correlation length, this results in well known Josephson effects reflecting the overlap of the wave function across barriers and weak links. Similar phenomena are harder to realize for 4He because the zero temperature correlation length is of the order of interatomic dimensions. The fact that for 4He the critical region, where the correlation length diverges, is accessible experimentally leads to a possible new kind of coupling. This differs from that of a superconductor in the sense that critical fluctuations are important. We have seen such coupling whereby two regions of confined 4He interact and influence their respective thermodynamic behavior (Perron et al. in Nat. Phys. 6:499-502, 2010). This interaction extends over length scales which are much larger than the correlation length. We describe measurements of heat capacity and superfluid density which illustrate this behavior. Springer Science+Business Media, LLC, 2010 Helium four nationallicence Superfluid transition nationallicence Weak links effects nationallicence Finite size effects nationallicence Critical phenomena nationallicence Finite size scaling nationallicence Coupling effect nationallicence Correlation lengths effects nationallicence Perron J. Department of Physics, The University at Buffalo, State University of New York, 14260, Buffalo, NY, USA aut Gasparini F. Department of Physics, The University at Buffalo, State University of New York, 14260, Buffalo, NY, USA aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/3-4(2011-02-01), 136-145 0022-2291 162:3-4<136 2011 162 10909 https://doi.org/10.1007/s10909-010-0306-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0306-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Perron J. Department of Physics, The University at Buffalo, State University of New York, 14260, Buffalo, NY, USA aut NATIONALLICENCE 700 1- Gasparini F. Department of Physics, The University at Buffalo, State University of New York, 14260, Buffalo, NY, USA aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/3-4(2011-02-01), 136-145 0022-2291 162:3-4<136 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer