Electron–Phonon Mechanism for Superconductivity in Na<sub>0.35</sub>CoO<sub>2</sub>: Valence-Band Suhl–Kondo Effect Driven by Shear Phonons
-
- Yada Keiji
- Department of Physics, Nagoya University
-
- Kontani Hiroshi
- Department of Physics, Nagoya University
書誌事項
- タイトル別名
-
- Electron–Phonon Mechanism for Superconductivity in Na0.35CoO2: Valence-Band Suhl–Kondo Effect Driven by Shear Phonons
この論文をさがす
抄録
To study the possible mechanism of superconductivity in Na0.35CoO2, we examine the interaction between all the relevant optical phonons (breathing and shear phonons) and t2g (a1g+eg′) electrons of Co ions, and study the transition temperature for s-wave superconductivity. The obtained Tc is very low when the eg′ valence bands are far below the Fermi level. However, Tc is strongly enhanced when the top of the eg′ valence bands is close to the Fermi level (e.g., −50 meV), thanks to the interband hopping of Cooper pairs caused by shear phonons. This “valence-band Suhl–Kondo mechanism” due to shear phonons is important in understanding the superconductivity in Na0.35CoO2. By the same mechanism, the kink structure of the band dispersion observed by angle-resolved photoemission spectroscopy (ARPES) measurements, which indicates the strong mass enhancement (m*⁄m∼3) due to optical phonons, is also explained.
収録刊行物
-
- Journal of the Physical Society of Japan
-
Journal of the Physical Society of Japan 75 (3), 033705-, 2006
一般社団法人 日本物理学会
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390282679166499456
-
- NII論文ID
- 110004704666
- 210000106028
-
- NII書誌ID
- AA00704814
-
- BIBCODE
- 2006JPSJ...75c3705Y
-
- ISSN
- 13474073
- 00319015
-
- NDL書誌ID
- 7852223
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可