Superconductivity in Palladium Hydride Systems
Superconductivity in Palladium Hydride Systems
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DOI：
10.7566/jpsj.89.051004
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发表时间：
2020-05-15
影响因子：
1.7
通讯作者：
Kimura, Takashi
中科院分区：
文献类型：
--
作者：
Kawae, Tatsuya;Inagaki, Yuji;Kimura, Takashi
钯-氢化物（Pd-H）体系的超导电性是由Skoskiewicz于1972年发现的。此后，已经对Pd-H和氘化钯（Pd-D）系统沿着它们的合金化（Pd-金属-H）系统进行了许多研究。在本文中，我们提出了一个简要的概述这些系统的超导性质。首先，我们描述了用于将H加载到Pd中的方法，其中三种主要技术，即，介绍了气体负载、电化学负载和氢离子注入。接下来，我们简要总结Pd-H（D）系统的超导性质，例如，转变温度Tc的浓度依赖性、反同位素效应、临界场、Tc的压力依赖性和杂质效应。随后，我们描述了我们最近的原位磁化测量超导Pd-H和Pd-D粉末的直径为1-2 μ m的低温H吸收，其中的吸收是在低于200 K下进行的氢（H-2）或氘（D-2）气体气氛中进行。此外，我们报告的电阻测量的Pd-H膜与类似的100 nm的厚度制备相同的H吸收过程。薄膜的超导转变温度与粉末的超导转变温度一致。从这些结果可以看出，低温吸氢法是制备高质量Pd-H和Pd-D样品的有效方法。
The superconductivity of palladium-hydride (Pd-H) system was discovered by Skoskiewicz in 1972. Thereafter, many studies have been carried out on Pd-H and palladium deuteride (Pd-D) systems along with their alloyed (Pd-metal-H) systems. In this paper, we present a brief overview of superconducting properties of these systems. First, we describe methods for H loading into Pd, in which three principal techniques, i.e., gas loading, electrochemical loading, and H implantation are introduced. Next, we briefly summarize the superconducting properties of Pd-H(D) systems, e.g., the concentration dependence of the transition temperature T-c, inverse isotope effect, critical field, pressure dependence of Tc, and the impurity effects. Subsequently, we describe our recent in-situ magnetization measurements of superconducting Pd-H and Pd-D powders with 1-2 mu m diameters prepared by low-temperature H absorption, in which the absorption was performed below 200K under hydrogen (H-2) or deuterium (D-2) gas atmosphere. Additionally, we report resistance measurements of a Pd-H film with similar to 100nm thickness prepared by the same H absorption procedure. The superconducting transition temperature of the film is consistent with that of the powders. From these results, we conclude that the low-temperature H absorption method is useful for preparing high quality Pd-H and Pd-D samples.