Electronic phase separation: recent progress in the old problem

Abstract

We consider the nanoscale electronic phase separation in a wide class of different materials, mostly in strongly correlated electron systems. The phase separation turns out to be quite ubiquitous manifesting itself in different situations, where the itineracy of charge carriers competes with their tendency toward localization. The latter is often related to some specific type of magnetic ordering, e.g. antiferromagnetic in manganites and low-spin states in cobaltites. The interplay between the localization-induced lowering of potential energy and metallicity (which provides the gain in the kinetic energy) favors an inhomogeneous ground state such as nanoscale ferromagnetic droplets in an antiferromagnetic insulating background. The present review article deals with the advances in the subject of electronic phase separation and formation of different types of nanoscale ferromagnetic (FM) metallic droplets (FM polarons or ferrons) in antiferromagnetically ordered (AFM), charge-ordered (CO), or orbitally-ordered (OO) insulating matrices, as well as the colossal magnetoresistance (CMR) effect and tunneling electron transport in the nonmetallic phase-separated state of complex magnetic oxides. It also touches upon the compounds with spin-state transitions, inhomogeneous phase-separated state in strongly correlated multiband systems, and electron polaron effect. A special, attention is paid to the systems with the imperfect Fermi surface nesting such as chromium alloys, iron-based pnictides, and AA stacked graphene bilayers.

135 pages, 72 figures, submitted to Physics Reports

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• Suppression of the structural phase transition and lattice softening in slightly underdoped Ba(1-x)K(x)Fe2As2 with electronic phase separation
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• Electron coherent and incoherent pairing instabilities in inhomogeneous bipartite and nonbipartite nanoclusters
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• Small-scale phase separation in doped anisotropic antiferromagnets
• Orbital order driven quantum criticality
• Novel Energy Scale in the Interacting 2D Electron System Evidenced from Transport and Thermodynamic Measurements
• Relationship between orbital structure and lattice distortions: CE phase of manganites, revisited
• Magnetic polarons in doped 1D antiferromagnetic chain
• Stabilization of magnetic polarons in antiferromagnetic semiconductors by extended spin distortions
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• Magnetic field effects in electron systems with imperfect nesting
• Elementary Excitations in the Symmetric Spin--Orbital Model
• Superconducting islands, phase fluctuations and the superconductor-insulator transition

Cited by in corpus (15)

• Realization of a doped quantum antiferromagnet with dipolar tunnelings in a Rydberg tweezer array
• Observation of an electronic microemulsion phase emerging from a quantum crystal-to-liquid transition
• Frenkel pair formation energy for cubic Fe${}_3$O${}_4$ in DFT+U calculations
• High-Tc superconducting dome in artificial heterostructures made of nanoscale quantum building blocks
• Nanoscale inhomogeneity of charge density waves dynamics in La${}_{2-x}$Sr${}_x$NiO${}_4$
• Formation of droplets of the order parameter and superconductivity in inhomogeneous Fermi-Bose mixtures (Brief review)
• Models of Mixed Matter
• Spontaneous layer selective Mott phase in the bilayer Hubbard model
• Charge-order on the triangular lattice: Effects of next-nearest-neighbor attraction in finite temperatures
• Forestalled Phase Separation as the Precursor to Stripe Order
• Coexistence of Multiple Magnetic Interactions in Oxygen Deficient V2O5 Nanoparticles
• Phase Separation in Two-Dimensional Electron Systems: Experimental View
• Umklapp-driven first-order transition into a charge-density wave phase
• Nesting-driven ferromagnetism of itinerant electrons
• Features of the Electronic and Charge States of Monovalent-Doped Manganite Films Probed by Magnetic Circular Dichroism