氢氧化钴超导体中Co价态的后还原调控
Tuning Co valence state in cobalt oxyhydrate superconductor by post reduction
摘要：
本文报道了用氢氧化钠作还原剂，通过简单的后还原，成功地调节了水合钴超导体中钴的价态。通过测量释放的氧的体积精确地确定Co价态的变化。在浓NaOH溶液中，可能的水合氢离子掺入被大大抑制，使得绝对Co价可测定。结果表明，在+3.58 ~+3.65的较窄范围内，超导转变温度随Co价态的增加而单调增加。
英文摘要：
We report a successful tuning of Co valence state in cobalt oxyhydrate superconductor via a facile post reduction using NaOH as reducing agent. The change in Co valence was precisely determined by measuring the volume of the released oxygen. The possible hydronium-incorporation was greatly suppressed in concentrated NaOH solution, making the absolute Co valence determinable. As a result, an updated superconducting phase diagram was obtained, which shows that the superconducting transition temperature increases monotonically with increasing Co valence in a narrow range from +3.58 to +3.65.
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