Intergrain Josephson Currents in Multigap Superconductors: Microscopic Origin of Low Intergrain Critical Current and Its Recovery Potential in Iron-Pnictide Materials
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- Ota Yukihiro
- CCSE, Japan Atomic Energy Agency CREST (JST)
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- Machida Masahiko
- CCSE, Japan Atomic Energy Agency CREST (JST) JST, TRIP
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- Koyama Tomio
- Institute for Materials Research, Tohoku University CREST (JST)
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We microscopically examine the intergrain Josephson current in iron-pnictide superconductors in order to solve the puzzle of why the intergrain current is much lower than the intragrain one. The theory predicts that the intergrain Josephson current is significantly reduced by the ±s-wave symmetry when the incoherent tunneling becomes predominant and the density of states and the gap amplitude between two bands are identical. We find in such a situation that the temperature dependence of the intergrain Josephson current shows an anomalously flat curve over a wide temperature range. Finally, we suggest important points for increasing the intergrain current.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 78 (10), 103701-103701, 2009
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390282679173838080
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- NII論文ID
- 130005437151
- 40016772339
- 210000108005
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- NII書誌ID
- AA00704814
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 10390229
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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