Pressure-induced magnetic transition and volume collapse in FeAs superconductors: An orbital-selective Mott scenario

Abstract

Motivated by pressure experiments on FeAs-122 superconductors, we propose a scenario based on local-moment physics to explain the simultaneous disappearance of magnetism, reduction of the unit cell volume, and decrease in resistivity. In this scenario, the low-pressure magnetic phase derives from Fe moments, which become screened in the paramagnetic high-pressure phase. The quantum phase transition can be described as an orbital-selective Mott transition, which is rendered first order by coupling to the lattice, in analogy to a Kondo volume collapse. Spin-fluctuation driven superconductivity competes with antiferromagnetism and may be stabilized at low temperatures in the high-pressure phase. The ideas are illustrated by a suitable mean-field analysis of an Anderson lattice model.

9 pages, 3 figs; (v2) robustness of OS Mott transition vs. fragility of superconductivity discussed, final version to be published

References in corpus (34)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Fermi-liquid instabilities at magnetic quantum phase transitions
• Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
• Theory of Electron Nematic Order in LaOFeAs
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures
• Fractionalized Fermi liquids
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• The challenge of unravelling magnetic properties in LaFeAsO
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study
• The Unprecedented Giant Coupling of Fe-spin State and the As-As Hybridization in Iron-Pnictide
• Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
• Iron pnictides as a new setting for quantum criticality
• Superconductivity at 53.5 K in GdFeAsO1-delta
• Lattice collapse and quenching of magnetism in CaFe2As2 under pressure: A single crystal neutron and x-ray diffraction investigation
• Non-Fermi Liquid Behavior and Double-Exchange Physics in Orbital-Selective Mott Systems
• Theory of the Magnetic Moment in Iron Pnictides
• Thermodynamic and spectral properties of compressed Ce calculated by the merger of the local density approximation and dynamical mean field theory
• Kondo Breakdown as a Selective Mott Transition in the Anderson Lattice
• Anisotropic three-dimensional magnetism in CaFe2As2
• Interplay between magnetic properties and Fermi surface nesting in iron pnictides
• Normal State Correlated Electronic Structure of Iron Pnictides
• Suppression of antiferromagnetic spin fluctuations in the collapsed tetragonal phase of CaFe2As2
• From itinerant to local-moment antiferromagnetism in Kondo lattices: Adiabatic continuity vs. quantum phase transitions
• Role of covalent Fe-As bonding in the magnetic moment formation and exchange mechanisms in iron-pnictide superconductors
• Mott State and Quantum Critical Points in Rare-Earth Oxypnictides $R{O}_{1-x}{F}_{x}FeAs$ ($R=La,Sm,Nd,Pr,Ce$)
• Kondo volume collapse, Kondo breakdown, and Fermi surface transitions in heavy-fermion metals
• Quantum critical end point of the Kondo volume collapse
• Character of magnetic instabilities in CaFe2As2

Cited by in corpus (25)

• Strong electronic correlations from Hund's coupling
• Selective Mottness as a key to iron superconductors
• Hund's coupling key role in multi-orbital correlations
• Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
• Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides
• Fermi-liquid, non-Fermi-liquid, and Mott phases in iron pnictides and cuprates
• Orbital Selectivity in Hund's metals: The Iron Chalcogenides
• Orbital-selective Mott transitions: Heavy fermions and beyond
• Microscopic origin of pressure-induced phase transitions in iron-pnictide $AF{e}_{2}A{s}_2$ superconductors: an {ab initio} molecular-dynamics study
• Correlation induced spin freezing transition in FeSe: a dynamical mean field study
• Superconductivity and its mechanism in an ab initio model for electron-doped LaFeAsO
• Evolution from unconventional spin density wave to superconductivity and a novel gap-like phase in NaFe1-xCoxAs
• Magneto-elastic quantum fluctuations and phase transitions in the iron superconductors
• Magnetic and superconducting instabilities in a hybrid model of itinerant/localized electrons for iron pnictides
• Chromium analogues of Iron-based superconductors
• Phase diagram and a possible unified description of intercalated iron selenide superconductors
• A General Mechanism for Orbital Selective Phase Transitions
• Magnetism and Mott Transition: A Slave-rotor Study
• La${}_2$O${}_3$Fe${}_2$Se${}_2$, a Mott insulator on the brink of orbital-selective metalization
• Extended regime of coexisting metallic and insulating phases in a two-orbital electronic system
• Microscopic description of insulator-metal transition in high-pressure oxygen
• Can Orbital-Selective Néel Transitions Survive Strong Nonlocal Electronic Correlations?
• Weak and strong electronic correlations in Fe superconductors
• Magnetism and Superconductivity in Iron-based Superconductors Decided by Condensed Particle-hole Excitations away from the Fermi Level
• Eliminating Orbital Selectivity from the Metal-Insulator Transition by Strong Magnetic Fluctuations