Fermi-Surface Reconstruction and Complex Phase Equilibria in CaFe${}_2$As${}_2$

Abstract

Fermi-surface topology governs the relationship between magnetism and superconductivity in iron-based materials. Using low-temperature transport, angle-resolved photoemission, and x-ray diffraction we show unambiguous evidence of large Fermi surface reconstruction in CaFe${}_2$As${}_2$ at magnetic spin-density-wave and nonmagnetic collapsed-tetragonal ($cT$) transitions. For the $cT$ transition, the change in the Fermi surface topology has a different character with no contribution from the hole part of the Fermi surface. In addition, the results suggest that the pressure effect in CaFe${}_2$As${}_2$ is mainly leading to a rigid-band-like change of the valence electronic structure. We discuss these results and their implications for magnetism and superconductivity in this material.

Accepted for publication in Phys. Rev. Lett. (April 3, 2014)

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• Correlation effects in the tetragonal and collapsed tetragonal phase of CaFe2As2
• Tuning electronic correlations in transition metal pnictides: chemistry beyond the valence count
• Optical properties of $A$Fe${}_2$As${}_2$ ($A=$Ca, Sr, and Ba) single crystals
• Superconductivity in Uncollapsed Tetragonal LaFe2As2
• Tetragonal and collapsed-tetragonal phases of CaFe2As2 -- a view from angle-resolved photoemission and dynamical mean field theory
• Improving quantum-transition temperatures in BaFe2As2-based crystals by removing local-lattice strain & electronic-structure disorder
• Transition to collapsed tetragonal phase in CaFe2As2 single crystals as seen by 57Fe Mossbauer spectroscopy
• Fermi-surface topological phase transition and horizontal order-parameter nodes in CaFe${}_2$As${}_2$ under pressure
• Emergent electronic structure of CaFe2As2
• Role of Magnetism in Superconductivity of BaFe2As2: Study of 5d Au-doped Crystals
• Dimensionality, nematicity and Superconductivity in Fe-based systems
• Role of electron-electron interactions in the charge dynamics of rare-earth-doped CaFe2As2
• Lattice Parameters Guide Superconductivity in Iron-Arsenides
• Influence of the surface symmetry breaking on the magnetism, collapsing and three dimensional dispersion of Co pnictides ACo2As2 (A=Ba, Sr, Ca)
• Drastic electronic structure reconstruction of Ca${}_{1-x}$Pr${}_x$Fe${}_2$As${}_2$ in the collapsed tetragonal phase
• Optical spectroscopy study of the collapsed tetragonal phase of CaFe${}_2$(As${}_{0.935}$P${}_{0.065}$)${}_2$ single crystals
• Lattice Disorder Effect on Magnetic Ordering of Iron Arsenides