TY - JOUR
T1 - Phase order in superfluid helium films
AU - Bramwell, Steven T.
AU - Faulkner, Michael F.
AU - Holdsworth, Peter C.W.
AU - Taroni, Andrea
PY - 2015/12/21
Y1 - 2015/12/21
N2 - Classic experimental data on helium films are transformed to estimate a finite-size phase order parameter that measures the thermal degradation of the condensate fraction in the two-dimensional superfluid. The order parameter is found to evolve thermally with the exponent , a characteristic, in analogous magnetic systems, of the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Universal scaling near the BKT fixed point generates a collapse of experimental data on helium and ferromagnetic films, and implies new experiments and theoretical protocols to explore the phase order. These results give a striking example of experimental finite-size scaling in a critical system that is broadly relevant to two-dimensional Bose fluids. This paper is dedicated to the memory of our friend and colleague Maxime Clusel, with whom we enjoyed many stimulating discussions on related topics.
AB - Classic experimental data on helium films are transformed to estimate a finite-size phase order parameter that measures the thermal degradation of the condensate fraction in the two-dimensional superfluid. The order parameter is found to evolve thermally with the exponent , a characteristic, in analogous magnetic systems, of the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Universal scaling near the BKT fixed point generates a collapse of experimental data on helium and ferromagnetic films, and implies new experiments and theoretical protocols to explore the phase order. These results give a striking example of experimental finite-size scaling in a critical system that is broadly relevant to two-dimensional Bose fluids. This paper is dedicated to the memory of our friend and colleague Maxime Clusel, with whom we enjoyed many stimulating discussions on related topics.
UR - http://www.scopus.com/inward/record.url?scp=84952803112&partnerID=8YFLogxK
U2 - 10.1209/0295-5075/112/56003
DO - 10.1209/0295-5075/112/56003
M3 - Article (Academic Journal)
AN - SCOPUS:84952803112
SN - 0295-5075
VL - 112
JO - EPL
JF - EPL
IS - 5
M1 - 56003
ER -