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${}_2$.

arXiv comment5 pages, 5 figures

References in corpus (33)

• Strong electronic correlations from Hund's coupling
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• FermiSurfer: Fermi-surface viewer providing multiple representation schemes
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Quantum critical point lying beneath the superconducting dome in iron-pnictides
• Emergence of the nematic electronic state in FeSe
• Selective Mottness as a key to iron superconductors
• Numerical extraction of de Haas - van Alphen frequencies from calculated band energies
• Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor KFe2As2
• Evolution of the Fermi surface of BaFe_2(As_{1-x}P_x)_2 on entering the superconducting dome
• Fermi surface of superconducting LaFePO determined by quantum oscillations
• Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe2As2
• Resistivity in the Vicinity of a Van Hove Singularity: Sr${}_2$RuO${}_4$ Under Uniaxial Pressure
• Anisotropic magnetization, specific heat and resistivity of RFe2Ge2 single crystals
• Emergent Kondo scaling in iron-based superconductors AFe2As2 (A = K, Rb, Cs)
• Fermi surface in KFe2As2 determined via de Haas-van Alphen oscillation measurements
• Quantum criticality in AFe2As2 with A = K, Rb, and Cs suppresses superconductivity
• Microscopic nature of correlations in multi-orbital AFe2As2 (A=K, Rb, Cs): Hund's coupling versus Coulomb repulsion
• Flux growth in a horizontal configuration: an analogue to vapor transport growth
• Unconventional superconductivity in the layered iron germanide YFe${}_2$Ge${}_2$
• Fermi liquid breakdown and evidence for superconductivity in YFe${}_2$Ge${}_2$
• Superconductivity and Magnetism in YFe${}_2$Ge${}_2$
• Unconventional sign-changing superconductivity near quantum criticality in YFe${}_2$Ge${}_2$
• Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2
• Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe${}_2$Ge${}_2$
• Unconventional bulk superconductivity in YFe${}_2$Ge${}_2$ single crystals
• Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe${}_2$Ge${}_2$
• Approaching itinerant magnetic quantum criticality through a Hund's coupling induced electronic crossover in the YFe${}_2$Ge${}_2$ superconductor
• Composition dependence of bulk superconductivity in YFe2Ge2
• Nearly ferromagnetic metal state in the collapsed tetragonal phase of YFe${}_2$(Ge,Si)${}_2$
• Fermi Surface of KFe${}_2$As${}_2$ from Quantum Oscillations in Magnetostriction

Cited by in corpus (4)

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