羟基氧化钠钴（NaxCoO2.yH2O，x约为0.3，y约为1.3）的外延膜生长与超导行为

Epitaxial film growth and superconducting behavior of sodium-cobalt oxyhydrate, NaxCoO2.yH2O (x approximately 0.3, y approximately 1.3).

作者信息

Sugiura Kenji, Ohta Hiromichi, Nomura Kenji, Yanagi Hiroshi, Hirano Masahiro, Hosono Hideo, Koumoto Kunihito

机构信息

Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan.

出版信息

Inorg Chem. 2006 Mar 6;45(5):1894-6. doi: 10.1021/ic051865m.

DOI:10.1021/ic051865m

PMID:16499345

Abstract

We have developed a unique multistep film growth technique, combining reactive solid-phase epitaxy (R-SPE) with an intercalation process, to fabricate epitaxial films of superconducting sodium-cobalt oxyhydrate, Na(0.3)CoO2.1.3H2O. An epitaxial film of Na(0.8)CoO2 grown on an alpha-Al2O3(0001) substrate by R-SPE was subjected to oxidation and hydration treatment, leading to the formation of a Na(0.3)CoO2.1.3H2O epitaxial film. The film exhibited metallic electrical resistivity with a superconducting transition at 4 K, similar to that of bulk single crystals. The present technique is suitable and probably the only method for the epitaxial growth of superconducting Na(0.3)CoO2.1.3H2O.

摘要

我们开发了一种独特的多步薄膜生长技术，将反应性固相外延（R-SPE）与插层过程相结合，以制备超导水合钠钴氧化物Na(0.3)CoO2·1.3H2O的外延薄膜。通过R-SPE在α-Al2O3(0001)衬底上生长的Na(0.8)CoO2外延薄膜经过氧化和水合处理，从而形成了Na(0.3)CoO2·1.3H2O外延薄膜。该薄膜表现出金属电阻率，并在4 K发生超导转变，这与块状单晶类似。目前的技术适用于并且可能是外延生长超导Na(0.3)CoO2·1.3H2O的唯一方法。