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Abstracts
O1.1
Huge Fermi liquid and non-Fermi liquid heat capacities of
3
He films
formed in 3D nanopore
N. Wada(1), T. Matsushita(1), T. Nishida(1), Y. Tsuchiya(1), Y. Hara(1), M.
Hieda(2)
1)Department of Physics, Nagoya University, Nagoya 464-8602, Japan
2)Col. of Lib. Arts & Sci., Tokyo Medical and Dental Univ., 2-8-30 Kounodai,
Ichikawa, 272-0827, Japan
We measured heat capacity C of
3
He film formed in 3D nanopore whose pores
2.7nm in diameter are connected with the 3D period 5.5nm. A very thin
3
He
film adsorbed on a
4
He layer preplated on nanopore wall shows the specific heat
of the 3D Boltzmann gas to 26mK, the lowest temperature measured. With
increasing the
3
He coverage, C approaches to linear in T at the low temperatures,
suggesting the degenerate state of the 3D Fermi gas/liquid. The observed
γ
-value
at a large
3
He coverage becomes much larger than that of the bulk
3
He liquid.
At another thickness of the preplated
4
He layer, C/T becomes proportional to
-log T that is a typical dependence of the non-Fermi liquid.
O1.2
Theory for a multi-chamber superfluid Helmholtz resonator and
superfluid fraction+
Gasparini, F. M., Thomson, R. D.
Department of Physics, University at Buffalo, SUNY, Buffalo, NY 14260, USA
We report resonances in superleaks consisting of three chambers formed by direct
bonding of Si wafers. A theory is presented for the resonances and compare with
the experimental superfluid fraction. The theory follows that of Rayleigh for an
open two–chamber gas Helmholtz resonator. One constructs a Lagrangian for
the system and derives the equations of motion. The equation for the resonant
frequency is sixth order. Solutions are obtained using the known dimensions of
the resonators. This theory allows one to separate the superfluid fraction effects
which are hydrodynamic in origin from effects which involve correlation-length
coupling among films of different thickness. These correlation-length effects are
described by a new kind of finite-size scaling [1].
[1] Stephen R. D. Thomson, Justin K. Perron and Francis M. Gasparini, submitted
to Phys. Rev. B.
+Work supported by NSF, DMR-1101189; M. L. Rustgi Professorship Endowment.
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