Fermi surface and mass renormalization in the iron-based superconductor YFe${}_2$Ge${}_2$

Abstract

Quantum oscillation measurements in the new unconventional superconductor YFe${}_2$Ge${}_2$ resolve all four Fermi surface pockets expected from band structure calculations, which predict an electron pocket in the Brillouin zone corner and three hole pockets enveloping the centers of the top and bottom of the Brillouin zone. The carrier masses are uniformly renormalized by about a factor of five and broadly account for the enhanced heat capacity Sommerfeld coefficient $\simeq 100$ mJ/molK${}^2$. Our data highlight the key role of the electron pocket, which despite its small volume accounts for about half the total density of states, and point towards a predominantly local mechanism underlying the mass renormalization in YFe${}_2$Ge${}_2$.

5 pages, 5 figures

References in corpus (8)

• Strong electronic correlations from Hund's coupling
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Emergence of the nematic electronic state in FeSe
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• Flux growth in a horizontal configuration: an analogue to vapor transport growth
• Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2
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Cited by in corpus (4)

• Unraveling the origin of Kondo-like behavior in the 3$d$-electron heavy-fermion compound YFe${}_2$Ge${}_2$
• Truncated mass divergence in a Mott metal
• Time reversal symmetry breaking and s-wave superconductivity in CaPd2Ge2: A $\mu$SR study
• Flat Topological Nodal Lines in Heavy-Fermion Compound CeCoGe${}_3$