Order Parameter Symmetry and Unconventional Superconductivity of Na0.30CoO2?1.3H2O Discussed from Experimental Results

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• 作者：Masaki Ohkawa
• 关键词：Order parameter symmetry ; Unconventional superconductors ; Cobalt oxide ; Superconductors
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：28
• 期：10
• 页码：3017-3026
• 全文大小：610 KB
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• 作者单位：Masaki Ohkawa (1)
  
  1. The National Science Foundation, 4201 Wilson Boulevard, Arlington, VA, 22230, USA
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

An unconventional superconductor of Na_0.30CoO₂?.3H₂O has been reviewed in view of its order parameter symmetry mainly from experimental results for this compound. This superconductor exhibits the ground state (a low field regime) that possesses singlet superconductivity (the s-wave) formed from various elemental order parameter symmetries, spin fluctuations within the C o O ₂ plane, and other physical properties, which are proved with comparing these experimental results with theoretical results in this field, and the order parameter symmetry can be identified as the extended s-wave. On the other hand, in the high field regime, triplet superconductivity has been detected by temperature dependence of upper critical fields (H _c2(T)) and that of Knight shift as well as the ground state. The triplet superconductivity is understood through Hund’s coupling, hyperfine coupling interaction, Nagaoka ferromagnetism, and the averaged valence of the Co ions in the CoO₂. The superconductivity is discussed using the various physical properties which influence the order parameter symmetry of this superconductor, and it also suggested that some quantum phase transitions can be detected with respect to superconductivity of title compounds. Keywords Order parameter symmetry Unconventional superconductors Cobalt oxide Superconductors