Superconductivity in Palladium Hydride Systems

Tatsuya Kawae, Yuji Inagaki, Si Wen, Souhei Hirota, Daiki Itou, Takashi Kimura

Research output: Contribution to journalArticle

Abstract

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 Tc, 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 µm diameters prepared by low-temperature H absorption, in which the absorption was performed below 200 K under hydrogen (H2) or deuterium (D2) gas atmosphere. Additionally, we report resistance measurements of a Pd–H film with ∼100 nm 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.

Original languageEnglish
Article number051004
Journaljournal of the physical society of japan
Volume89
Issue number5
DOIs
Publication statusPublished - May 15 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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