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
• Superconductivity in Uncollapsed Tetragonal LaFe2As2
• Lattice Parameters Guide Superconductivity in Iron-Arsenides
• Role of electron-electron interactions in the charge dynamics of rare-earth-doped CaFe2As2
• Influence of the surface symmetry breaking on the magnetism, collapsing and three dimensional dispersion of Co pnictides ACo2As2 (A=Ba, Sr, Ca)
• Optical spectroscopy study of the collapsed tetragonal phase of CaFe${}_2$(As${}_{0.935}$P${}_{0.065}$)${}_2$ single crystals
• Drastic electronic structure reconstruction of Ca${}_{1-x}$Pr${}_x$Fe${}_2$As${}_2$ in the collapsed tetragonal phase