Strain dependence of the acoustic properties of amorphous metals below 1 K: Evidence for the interaction between tunneling states
Strain dependence of the acoustic properties of amorphous metals below 1 K: Evidence for the interaction between tunneling states
复制标题
1 K 以下非晶金属声学特性的应变依赖性：隧道态之间相互作用的证据
DOI：
10.1103/physrevb.65.180201
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发表时间：
2002
影响因子：
3.7
通讯作者：
P. Esquinazi
中科院分区：
文献类型：
--
作者：
R. Koenig;M. Ramos;I. Usherov;J. Arcas;A. Hernando;P. Esquinazi
我们对非晶金属Zr x Cu 1 - x （x=0.3和x=0.4）在10 - 4和1 K之间的声学特性进行了深入的研究，通过测量声速Δυ/υ和内摩擦Q - 1作为温度和施加应变的函数，在超导和正常状态下。我们发现，当绘制应变能与热能的比值时，所有测量结果都显示出相同的行为：在非常低的应变和/或足够高的温度下，从“独立”隧道系统的线性制度到非线性制度的交叉，其中Δυ/υ和Q - 1取决于施加的应变，隧道系统不能被认为是独立的。
We have conducted a thorough study of the acoustic properties between 10 - 4 and 1 K for the amorphous metal Zr x Cu 1 - x (x=0.3 and x=0.4), by measuring the relative change of sound velocity Δυ/υ and internal friction Q - 1 as a function of temperature and also of the applied strain, in both superconducting and normal states. We have found that when plotted versus the ratio of strain energy to thermal energy, all measurements display the same behavior: a crossover from a linear regime of "independent" tunneling systems at very low strains and/or high enough temperatures to a nonlinear regime where Δυ/υ and Q - 1 depend on applied strain and the tunneling systems cannot be considered as independent.