Pairing mechanism in Fe-based superconductors

By A. Chubukov. 2011

412 citations recorded by the source corpus.

I review recent works on the symmetry and the structure of the superconducting gap in Fe-based superconductors (FeSCs) and on the underlying pairing mechanism in these systems. The experimental data on superconductivity show very rich behavior, with potentially different symmetry of a superconducting state for different compositions of the same material. The variety of different pairing states raises the issue of whether the physics of FeSCs is model dependent or is universal, governed by a single underlying pairing mechanism. I argue that the physics is universal and that all pairing states obtained so far can be understood within the same universal pairing scenario and are well described by the effective low-energy model with small numbers of input parameters.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/89a491a0a81f713b96b0123c92459cdcd7017ea7

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In Condensed Matter Physics

1. E. Dagotto
2. R. Fernandes
3. J. Schmalian
4. P. Dai
5. A. Chubukov
6. M. Khodas
7. Jiangping Hu
8. L. Balents

In Electronic, Optical and Magnetic Materials

1. E. Dagotto
2. R. Fernandes
3. P. Dai
4. J. Schmalian
5. A. Chubukov
6. M. Khodas
7. Jiangping Hu
8. L. Balents

Citations in the corpus

• Introduction to holographic superconductor models (2015, neutral): “[106, 107, 108].”
• Magnetism, Superconductivity, and Spontaneous Orbital Order in Iron-Based Superconductors: Which Comes First and Why? (2016, background): “fluctuations that drive Ising-nematic order also favor a sign-changing sþ− SC [2,3,5,10,30].”
• Nematic order in iron superconductors - who is in the driver's seat? (2013, background): “In this situation, the system is known to develop either an unconventional s superconductivity, in which the gap functions have different signs in the hole and in the electron pockets, or a dx2−y2 superconductivity [2, 3].”
• Angle-resolved photoemission studies of quantum materials (2020, neutral): “…and Chubukov, 2016; Fernandes et al., 2014; Georges et al., 2013; Haule and Kotliar, 2009; Si et al., 2016), superconducting pairing mechanism (Bang and Stewart, 2017; Chubukov, 2012; Hirschfeld et al., 2011; Scalapino, 2012), and thin film forms of FeSCs (Lee, 2018; Pustovit and Kordyuk, 2016).”
• Magnetism and its microscopic origin in iron-based high-temperature superconductors (2012, background): “[24] Chubukov, A.”
• What drives nematic order in iron-based superconductors? (2014, methodology): “For instance, explicit evaluation of the ferro-orbital susceptibility using the multi-orbital Hubbard model finds that it is enhanced only in the presence of spin fluctuations 45, similarly to what is described by equation (3).”
• Electronic instabilities of kagome metals: Saddle points and Landau theory (2021, background): “These topics have been most heavily investigated in theory and experiment in structures based on square lattices in the cuprates [4, 13] and Fe superconductors [3, 14, 15].”