TY - JOUR

T1 - Scaling results for superfluid He-3 in 98% open aerogel

AU - Parpia, J. M.

AU - Fefferman, A. D.

AU - Porto, J. V.

AU - Dmitriev, V. V.

AU - Levitin, L. V.

AU - Zmeev, D. E.

PY - 2008/2

Y1 - 2008/2

N2 - We present experimental observations of the suppressed superfluid transition temperature, T-ca, superfluid fraction, rho(s)/rho and Leggett frequency of He-3-B in aerogel, Omega(Ba). We determine T-ca from mass decoupling and the vanishing of the frequency shift away from the Larmor frequency in our different samples and different laboratories. We find that the suppressed transition temperature for He-3 in aerogel occurs at a sample dependent, but approximately pressure independent, length, X = xi(0)(P)/root 1 - T-ca/T-c,T- where T-c and xi(0)(P), are the transition temperature and the pressure dependent zero temperature coherence length for bulk He-3. T-ca also occurs at a pressure independent value of the Leggett frequency of bulk He-3-B. Further, we find that when the superfluid fraction and square of the Leggett frequency are plotted against T-ca - T (and not (T-ca - T)/T-ca), the results of each measurement nearly collapse on to a pressure independent but sample dependent plot, with no further scaling. When plotted on a log-log scale, both measurements exhibit power laws in the range 1.33-1.45.

AB - We present experimental observations of the suppressed superfluid transition temperature, T-ca, superfluid fraction, rho(s)/rho and Leggett frequency of He-3-B in aerogel, Omega(Ba). We determine T-ca from mass decoupling and the vanishing of the frequency shift away from the Larmor frequency in our different samples and different laboratories. We find that the suppressed transition temperature for He-3 in aerogel occurs at a sample dependent, but approximately pressure independent, length, X = xi(0)(P)/root 1 - T-ca/T-c,T- where T-c and xi(0)(P), are the transition temperature and the pressure dependent zero temperature coherence length for bulk He-3. T-ca also occurs at a pressure independent value of the Leggett frequency of bulk He-3-B. Further, we find that when the superfluid fraction and square of the Leggett frequency are plotted against T-ca - T (and not (T-ca - T)/T-ca), the results of each measurement nearly collapse on to a pressure independent but sample dependent plot, with no further scaling. When plotted on a log-log scale, both measurements exhibit power laws in the range 1.33-1.45.

KW - superfluid He-3

KW - aerogel

U2 - 10.1007/s10909-007-9571-y

DO - 10.1007/s10909-007-9571-y

M3 - Journal article

VL - 150

SP - 482

EP - 486

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

SN - 0022-2291

IS - 3-4

T2 - International Symposium on Quantum Fluids and Solids (QFS-2007)

Y2 - 1 August 2007 through 6 August 2007

ER -