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Open Access Publications from the University of California

Visualizing heavy fermion formation and their unconventional superconductivity in f-electron materials

  • Author(s): Aynajian, P
  • Da Silva Neto, EH
  • Zhou, BB
  • Misra, S
  • Baumbach, RE
  • Fisk, Z
  • Mydosh, J
  • Thompson, JD
  • Bauer, ED
  • Yazdani, A
  • et al.

© 2014 The Physical Society of Japan. In solids containing elements with f-orbitals, the interaction between f-electron spins and those of itinerant electrons leads to the development of low-energy fermionic excitations with a heavy effective mass. These excitations are fundamental to the appearance of unconventional superconductivity observed in actinide- and lanthanide-based compounds. We use spectroscopic mapping with the scanning tunneling microscope to detect the emergence of heavy excitations with lowering of temperature in Ce- and U-based heavy fermion compounds. We demonstrate the sensitivity of the tunneling process to the composite nature of these heavy quasiparticles, which arises from quantum entanglement of itinerant conduction and f-electrons. Scattering and interference of the composite quasiparticles is used in the Cebased compounds to resolve their energy-momentum structure and to extract their mass enhancement, which develops with decreasing temperature. Finally, by extending these techniques to much lower temperatures, we investigate how superconductivity, with a nodal d-wave character, develops within a strongly correlated band of composite excitations.

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