Finite-size scaling and universality of the thermal resistivity of liquid 4He near Tlambda.
We present measurements of the thermal resistivity rho(t,P,L) near the superfluid transition of 4He at saturated vapor pressure and confined in cylindrical geometries with radii L=0.5 and 1.0 microm [t identical with T/T(lambda)(P)-1]. For L=1.0 microm measurements at six pressures P are presented. At and above T(lambda) the data are consistent with a universal scaling function F(X)=(L/xi(0))(x/nu)(rho/rho(0)), X=(L/xi(0))(1/nu)t valid for all P (rho(0) and x are the pressure-dependent amplitude and effective exponent of the bulk resistivity rho, and xi=xi(0)t(-nu) is the correlation length). Indications of breakdown of scaling and universality are observed below T(lambda).
Murphy
Daniel
D
Department of Physics and iQUEST, University of California, Santa Barbara, California 93106, USA.
Genio
Edgar
E
Ahlers
Guenter
G
Liu
Fengchuan
F
Liu
Yuanming
Y