Nonlinear Space-Charge-Limited Ion Currents in Solid Helium
Nonlinear Space-Charge-Limited Ion Currents in Solid Helium
复制标题
固体氦中非线性空间电荷限制离子电流
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
A. Dahm
中科院分区：
文献类型：
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作者：
S. Lau;A. Dahm
得到了稳态和瞬态空间电荷限制电流的非线性速度场关系式v(E) = (μ/γ) × sinh（γE）。用这些表达式对实验结果进行了分析。正离子扩散系数是一个张量，具有沿c轴和基面上运动的两个活化能。对于bcc3He，负离子速度对场的依赖是高度非线性和温度依赖的。结果与其他作者的结果进行了比较，并结合固体氦离子运动的不同模型进行了讨论。对正离子和同位素杂质的扩散系数进行了比较和讨论。
Expressions are obtained for steady-state and transient space-charge-limited currents for a nonlinear velocity-field relation of the form v(E) = (μ/γ) × sinh(γE). Our experimental results are analyzed with these expressions. The positive-ion diffusion coefficient is a tensor with two activation energies associated with motion along c axis and in the basal plane. For bcc3He the dependence of negative-ion velocity on field is highly nonlinear and temperature dependent. Results are compared with those of other authors and discussed in light of different models for ionic motion in solid helium. The diffusion coefficients for positive ions and isotopic impurities are compared and discussed.