Evidence for a Superglass State in Solid 4He

被引：116

作者：

Hunt, B. ^{[1
]}

Pratt, E. ^{[1
]}

Gadagkar, V. ^{[1
]}

Yamashita, M. ^{[1
,2
]}

Balatsky, A. V. ^{[3
]}

Davis, J. C. ^{[1
,4
]}

机构：

[1] Cornell Univ, Dept Phys, Atom & Solid State Phys Lab, Ithaca, NY 14853 USA

[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[3] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Div T, Los Alamos, NM 87545 USA

[4] Univ St Andrews, Scottish Univ Phys Alliance, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

来源：

SCIENCE | 2009年 / 324卷 / 5927期

基金：

日本学术振兴会; 加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

BOSE-EINSTEIN CONDENSATION; SUPERSOLIDITY; SUPERFLUID; CRYSTALS; HELIUM;

D O I：

10.1126/science.1169512

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Although solid helium-4 (He-4) may be a supersolid, it also exhibits many phenomena unexpected in that context. We studied relaxation dynamics in the resonance frequency f(T) and dissipation D(T) of a torsional oscillator containing solid He-4. With the appearance of the "supersolid" state, the relaxation times within f(T) and D(T) began to increase rapidly together. More importantly, the relaxation processes in both D(T) and a component of f(T) exhibited a complex synchronized ultraslow evolution toward equilibrium. Analysis using a generalized rotational susceptibility revealed that, while exhibiting these apparently glassy dynamics, the phenomena were quantitatively inconsistent with a simple excitation freeze-out transition because the variation in f was far too large. One possibility is that amorphous solid He-4 represents a new form of supersolid in which dynamical excitations within the solid control the superfluid phase stiffness.

引用

页码：632 / 636

页数：5

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