Uncovering the peculiar 4f electrons in heavy fermions

The locally noncentrosymmetric heavy fermion superconductor CeRh$_{2}$As$_{2}$ has attracted considerable interests due to its rich superconducting phases, accompanied by possible quadrupole density wave and pronounced antiferromagnetic excitations. To understand the underlying physics, we here report measurements from high-resolution angle-resolved photoemission. Our results reveal fine splittings of the conduction bands related to the locally noncentrosymmetric structure, as well as a quasi-two-dimensional Fermi surface (FS) with strong $4f$ contributions. The FS shows signs of nesting with an in-plane vector ${\mathbf{q}}_1$ = ($\pi/a$, $\pi/a$), which is facilitated by the heavy bands near $\bar{X}$ arising from the characteristic conduction-$f$ hybridization. The FS nesting provides a natural explanation for the observed antiferromagnetic spin fluctuations at ($\pi/a$, $\pi/a$), which might be the driving force for its unconventional superconductivity. Our experimental results can be reasonably explained by density functional theory plus dynamical mean field theory calculations, which can capture the strong correlation effects. Our study not only provides spectroscopic signature of the key factors underlying the field-induced superconducting transition, but also uncovers the critical role of FS nesting and lattice Kondo effect in the underlying magnetic fluctuations.

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Uncovering the peculiar 4f electrons in heavy fermions

Cited by 4 publications

References 13 publications

A unified theory of ferromagnetic quantum phase transitions in heavy fermion metals

A unified theory of ferromagnetic quantum phase transitions in heavy fermion metals

Hybridization-mediated quasiparticle and phonon dynamics in single crystal cerium films

Fermi Surface Nesting with Heavy Quasiparticles in the Locally Noncentrosymmetric Superconductor CeRh₂As₂

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Uncovering the peculiar 4f electrons in heavy fermions

Cited by 4 publications

References 13 publications

A unified theory of ferromagnetic quantum phase transitions in heavy fermion metals

A unified theory of ferromagnetic quantum phase transitions in heavy fermion metals

Hybridization-mediated quasiparticle and phonon dynamics in single crystal cerium films

Fermi Surface Nesting with Heavy Quasiparticles in the Locally Noncentrosymmetric Superconductor CeRh2As2

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Fermi Surface Nesting with Heavy Quasiparticles in the Locally Noncentrosymmetric Superconductor CeRh₂As₂