Thermodynamic properties of the clathrate-type silver-oxide Ag₆O₈AgHF₂

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• 作者：K. Kawashima ; M. Kriener ; M. Ishii ; Y. Maeno ; J. Akimitsu
• 关键词：Clathrate-type ; Silver-oxide ; Resistivity ; AC susceptibility ; Specific heat ; Ag₆O₈AgHF₂
• 刊名：Physica C
• 出版年：2008
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：30 March 2008
• 卷：468
• 期：6
• 页码：464-470
• 文件大小：1159 K

摘要

We report normal-state and superconducting properties of the clathrate-type silver-oxide Ag₆O₈AgHF₂. We present electrical resistivity, DC- and AC-susceptibility and specific-heat measurements of single crystalline Ag₆O₈AgHF₂. In the normal state, Ag₆O₈AgHF₂ exhibits metallic conductivity and a phase transition near 110 K, possibly a structural phase transition as observed in the related compound Ag₆O₈AgNO₃. The onset of superconductivity of our samples is observed around 1.2–1.5 K, and the H–T phase diagram is determined for the first time. The upper critical field H_c2(0) is estimated to be about 2000–2200 Oe and the coherence length ξ_GL(0) to be 40 nm.