Three- to Two-Dimensional Transition of the Electronic Structure in CaFe2As2 - parent compound for an iron arsenic high temperature superconductor

Abstract

We use angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of CaFe2As2 - parent compound of a pnictide superconductor. We find that the structural and magnetic transition is accompanied by a three- to two-dimensional (3D-2D) crossover in the electronic structure. Above the transition temperature (Ts) Fermi surfaces around Gamma and X points are cylindrical and quasi-2D. Below Ts the former becomes a 3D ellipsoid, while the latter remains quasi-2D. This finding strongly suggests that low dimensionality plays an important role in understanding the superconducting mechanism in pnictides.

Submitted to Phys. Rev. Lett. at 21 January 2009, Accepted for publication at 24 March 2009

References in corpus (22)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c2}$ in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study
• First order structural phase transition in CaFe${}_2$As${}_2$
• Crystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F
• Momentum dependence of the superconducting gap in NdFeAsO1-xFx single crystals measured by angle resolved photoemission spectroscopy
• The Fermi surface of Ba(1-x)K(x)Fe2As2 and its evolution with doping
• (pi,pi)-electronic order in iron arsenide superconductors
• Multiple Nodeless Superconducting Gaps in (Ba0.6K0.4)Fe2As2 Superconductor from Angle-Resolved Photoemission Spectroscopy
• Different resistivity response to spin density wave and superconductivity at 20 K in $C{a}_{1-x}N{a}_{x}F{e}_{2}A{s}_2$
• The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure
• Quantum oscillations in the parent magnetic phase of an iron arsenide high temperature superconductor
• Momentum-dependence of Superconducting Gap, strong-coupling dispersion Kink, and tightly bound Cooper pairs in the high-Tc (Sr,Ba)1-x(K,Na)xFe2As2 superconductors
• Tightly-bound Cooper pair, quasiparticle kinks and clues on the pairing potential in a high Tc FeAs Superconductor
• Anisotropic magnetic and superconducting properties of pure and Co-doped CaFe${}_2$As${}_2$ single crystals
• Direct observation of a Fermi surface and superconducting gap in LuNi2B2C

Cited by in corpus (48)

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• Critical change in the Fermi surface of iron arsenic superconductors at the onset of superconductivity
• Observation of Dirac Cone Electronic Dispersion in BaFe2As2
• Iron based superconductors: magnetism, superconductivity and electronic structure
• Fe-based superconductors: an angle-resolved photoemission spectroscopy perspective
• Unconventional electronic reconstruction in undoped (Ba,Sr)Fe${}_2$As${}_2$ across the spin density wave transition
• Importance of Fermi surface topology for high temperature superconductivity in electron-doped iron arsenic superconductors
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• Nesting between hole and electron pockets in Ba(Fe1-xCox)2As2 (x=0-0.3) observed with angle-resolved photoemission
• Complete Fermi surface in BaFe${}_2$As${}_2$ observed via Shubnikov-de Haas oscillation measurements on detwinned single crystals
• Paramagnetic Spin Correlations in CaFe2As2 Single Crystals
• Enhancement of the superconducting gap by nesting in CaKFe4As4 - a new high temperature superconductor
• Orbital character variation of the Fermi surface and doping dependent changes of the dimensionality in BaFe2-xCoxAs2 from angle-resolved photoemission spectroscopy
• Three-dimensional electronic structure of superconducting iron pnictides observed by angle-resolved photoemission spectroscopy
• What controls the phase diagram and superconductivity in Ru substituted BaFe${}_2$As${}_2$?
• Enhanced Fermi surface nesting in superconducting BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ revealed by de Haas-van Alphen effect
• Incoherent Cooper pairing and pseudogap behavior in single-layer FeSe/SrTiO${}_3$
• Existence, character and origin of surface-related bands in the high temperature iron pnictide superconductor BaFe_{2-x}Co_{x}As_{2}
• Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers
• Nernst effect in single crystals of the pnictide superconductor CaFe1.92Co0.08As2 and parent compound CaFe2As2
• Dramatic Changes in the Electronic Structure Upon Transition to the Collapsed Tetragonal Phase in CaFe2As2
• Unusual temperature dependence of band dispersion in Ba(Fe(1-x)Ru(x))2As2 and its consequences for antiferromagnetic ordering
• Surface-driven electronic structure in LaFeAsO studied by angle resolved photoemission spectroscopy
• Droplet-like Fermi surfaces in the anti-ferromagnetic phase of EuFe${}_2$As${}_2$, an Fe-pnictide superconductor parent compound
• Correlation effects in the tetragonal and collapsed tetragonal phase of CaFe2As2
• Fermi surface topology and low-lying electronic structure of a new iron-based superconductor Ca10(Pt3As8)(Fe2As2)5
• Fermi-Surface Reconstruction and Complex Phase Equilibria in CaFe${}_2$As${}_2$
• Universal magnetic and structural behaviors in the iron arsenides
• The magnetic moment enigma in Fe-based high temperature superconductors
• Bulk electronic structure of optimally doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Electronic Structure of CeFeAsO1-xFx (x=0, 0.11/x=0.12) compounds
• Angle-Resolved Photoemission Spectroscopy Study of BaCo2As2
• Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2
• Ab-initio perspective on structural and electronic properties of iron-based superconductors
• Emergent electronic structure of CaFe2As2
• Electronic structure of CaFe2As2
• Pressure-temperature phase diagrams of CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ superconductors
• Thermoelectric power of Ba(Fe1-xRux)2As2 and Ba(Fe1-xCox)2As2: possible changes of Fermi surface with and without changes in electron count
• Experimental investigation of the electronic structure of Ca${}_{0.83}$La${}_{0.17}$Fe${}_2$As${}_2$
• Hidden phase in parent Fe-pnictide superconductors
• Fermi-surface reconstruction involving two Van Hove singularities across the antiferromagnetic transition in BaFe2As2
• Drastic electronic structure reconstruction of Ca${}_{1-x}$Pr${}_x$Fe${}_2$As${}_2$ in the collapsed tetragonal phase
• Experimental and theoretical electronic structure of EuRh2As2
• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides
• Observation of the Dirac Dispersions in Co-doped CaFe2As2
• Observation of a ubiquitous three-dimensional superconducting gap function in optimally-doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$
• Electronic structure of $A$Co${}_2$As${}_2$ ($A=$ Ca, Sr, Ba, Eu) studied using angle-resolved photoemission spectroscopy and theoretical calculations