High-T c and Low-T c Superconductivity in Electron Systems with Repulsion

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• 作者：Maxim Yu. Kagan ; Vitaly A. Mitskan…
• 关键词：Unconventional superconductivity ; Kohn ; Luttinger mechanism ; Graphene
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：29
• 期：4
• 页码：1043-1048
• 全文大小：1,095 KB
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• 作者单位：Maxim Yu. Kagan (1) (2)
  Vitaly A. Mitskan (3) (4)
  Maxim M. Korovushkin (3) (5)
  
  1. P. L. Kapitza Institute for Physical Problems, 119334, Moscow, Russia
  2. National Research University Higher School of Economics, 109028, Moscow, Russia
  3. Kirensky Institute of Physics, SB RAS, 660036, Krasnoyarsk, Russia
  4. Siberian State Aerospace University, 660014, Krasnoyarsk, Russia
  5. Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91, Stockholm, Sweden
  
• 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

We demonstrate the instability of the normal state of purely repulsive fermionic systems towards the transition to the Kohn-Luttinger superconducting state. We construct the superconducting phase diagrams of these systems in the framework of the Hubbard and Shubin-Vonsovsky models on the square and hexagonal lattices. We show that an account for the long-range Coulomb interactions, as well as the Kohn- Luttinger renormalizations, lead to an increase in the critical superconducting temperatures in various materials, such as high-temperature superconductors, idealized monolayer, and bilayer of doped graphene. Additionally, we discuss the role of the structural disorder and the nonmagnetic impurities in superconducting properties of real graphene systems.