Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
권호 표지
DOI QR코드

DOI QR Code

Exotic superconducting state under high magnetic fields: Insights from iron-based superconductor

  • Min Jae Kim (Department of Physics, Pusan National University) ;
  • Jong Mok Ok (Department of Physics, Pusan National University)
  • Received : 2023.06.14
  • Accepted : 2023.06.25
  • Published : 2023.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Over the past decade, the exploration of high-temperature superconductivity and the discovery of a wide range of exotic superconducting states in Fe-based materials have propelled condensed matter physics research to new frontiers. These materials exhibit intriguing phenomena arising from their multiband electronic structure, strongly orbital-dependent effects, extremely small Fermi energy, electronic nematicity, and topological aspects. Among the various factors influencing their superconducting properties, high magnetic fields play a crucial role as a control knob capable of disrupting the subtle balance between the spin, charge, lattice, and orbital degrees of freedom, leading to the emergence of various exotic superconducting states. In this review, we provide an overview of the current understanding of the exotic superconducting states observed in Fe-based superconductors, with a particular focus on FeSe and Sr2VO3FeAs, under the influence of high magnetic fields.

Keywords

Acknowledgement

This work was supported by the Research Fund Program of Research Institute for Basic Sciences, Pusan National University, Korea.

References

  1. N. R. Werthamer, E. Helfand, and P. C. Hohenberg, "Temperature and Purity Dependence of the Superconducting Critical Field, Hc2. III. Electron Spin and Spin-Orbit Effect", Phys. Rev. Lett. 147, 295 (1966)
  2. E. Helfand and N. R. Werthamer, "Temperature and Purity Dependence of the Superconducting Critical Field, Hc2. II.", Phys. Rev. Lett. 147, 288 (1966)
  3. G. Sarma, "On the influence of a uniform exchange field acting on the spins of the conduction electrons in a superconductor", J. Phys. Chem. Solids 24, 1029 (1963).
  4. Maki. Kazumi and Tsuneto. Toshigiko, "Pauli Paramagnetism and Superconducting State", Prog. Theor. Phys. 31, 945 (1964)
  5. A. Gurevich, "Iron-based superconductors at high magnetic fields", Rep. Prog. Phys. 74, 124501 (2011)
  6. J. M. Ok, C. I. Kwon, Y. Kohama, J. S. You, S. K. Park. J. H. Kim et al., "Observation of in-plane magnetic field induced phase transitions in FeSe", Phys. Rev. B. 101, 224509 (2020)
  7. J. M. Ok, S-H. Baek, C. Hoch, R.K. Kremer, S. Y. Park, S. Ji et al., "Frustration-driven C4 symmetric order in a naturally-heterostructured superconductor Sr2VO3FeAs" Nat. Commun. 8, 2167 (2017)
  8. S. Kim, J. M. Ok, H. Oh, C. I. Kwon, Y. Zhang, J. D. Denlinger et al.,"Band-selective gap opening by a C4-symmetric order in a proximity-coupled heterostructure Sr2VO3FeAs" Proc. Acad. Sci. USA 118, e2105190118 (2021)
  9. J. M. Ok, C. I. Kwon, O. E. Ayala Valenzuela, S. Kim, R. D. McDonald, J. Kim, et al., "Strong antiferromagnetic proximity coupling in the heterostructure superconductor Sr2VO3-δFeAs", Phys. Rev. B. 105, 214505 (2022)