Two-dimensional excitations of superfluid 4He confined in 72% porosity xerogel

被引：6

作者：

Anderson, CR

Stirling, WG

Andersen, KH

Sokol, PE

Dimeo, RM

机构：

[1] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[2] Univ Liverpool, Dept Phys, Liverpool L69 7ZX, Merseyside, England

[3] Rutherford Appleton Lab, ISIS Div, Didcot OX11 0QX, Oxon, England

[4] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[5] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

PHYSICA B | 2000年 / 276卷

基金：

英国工程与自然科学研究理事会; 美国国家科学基金会;

关键词：

helium; low-dimensional systems; low temperature; superfluidity; phonon dispersion;

D O I：

10.1016/S0921-4526(99)01610-5

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present neutron inelastic-scattering measurements of the low-energy excitation spectrum of superfluid He-4 confined in porous xerogel glass. In addition to the bulk-like excitation, we also observe a broad peak centred at energies of less than that of the bulk-like peak. The dependence an filling fraction of bath peaks has been investigated and we find that the second broad peak exhibits behaviour that is consistent with that of an excitation confined to the high-density liquid layers near the pore walls. i.e, with that of a two-dimensional excitation. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：820 / 821

页数：2

共 3 条

[1] Excitations in a thin liquid He-4 film from inelastic neutron scattering [J].