Phase separation of superconducting phases in the Penson-Kolb-Hubbard model

Abstract

In this paper we determine the phase diagrams (for $T=0$ as well as $T>0$) of the Penson-Kolb-Hubbard model for two dimensional square lattice within Hartree-Fock mean-field theory focusing on investigation of superconducting phases and possibility of the occurrence of the phase separation. We obtain that the phase separation, which is a state of coexistence of two different superconducting phases (with $s$-wave and $\eta$-wave symmetries), occurs in define range of the electron concentration. In addition, increasing temperature can change the symmetry of the superconducting order parameter (from $\eta$-wave into $s$-wave). The system considered exhibits also an interesting multicritical behaviour including bicritical points.

arXiv comment8 pages, 6 figures, ReVTeX, minor changes in text, proper list of authors given

References in corpus (42)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• Discovery of microscopic electronic inhomogeneity in the high-Tc superconductor Bi2Sr2CaCu2O8+x
• Nanoscale phase separation in the iron chalcogenide superconductor K0.8Fe1.6Se2 as seen via scanning nanofocused x-ray diffraction
• Competing order and nature of the pairing state in the iron pnictides
• Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba(1-x)K(x)Fe(2)As(2)
• Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2
• Muon spin relaxation studies of incommensurate magnetism and superconductivity in stage-4 La${}_2$CuO${}_{4.11}$ and La${}_{1.88}$Sr${}_{0.12}$CuO${}_4$
• Superconductivity coexisting with phase-separated static magnetic order in (Ba,K)Fe${}_2$As${}_2$, (Sr,Na)Fe${}_2$As${}_2$ and CaFe${}_2$As${}_2$
• $\eta$-pairing as a mechanism of superconductivity in models of strongly correlated electrons
• Metastable superfluidity of repulsive fermionic atoms in optical lattices
• Majorana edge states in two atomic wires coupled by pair-hopping
• Evolution of symmetry and structure of the gap in Fe-based superconductors with doping and interactions
• Exact ground states of generalized Hubbard models
• η-superconductivity in the Hubbard chain with pair hopping
• Superconductivity in the Hubbard model with pair hopping
• Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
• Coexistence or Separation of the Superconducting, Antiferromagnetic, and Paramagnetic Phases in Quasi One-Dimensional (TMTSF)2PF6 ?
• Fulde-Ferrell-Larkin-Ovchinnikov phase in the presence of pair hopping interaction
• Odd parity pairing and nodeless anti-phase $s^{\pm }$ in Iron-Based Superconductors
• Mesoscopic Phase Separation in Anisotropic Superconductors
• Phase separation in a lattice model of a superconductor with pair hopping
• Superconductivity assisted by inter-layer pair hopping in multi-layered cuprates
• Critical field in a model with local pairs
• Small-q Phonon Mediated Unconventional Superconductivity in the Iron Pnictides
• Phase Diagram of the Extended Hubbard Model with Pair Hopping Interaction
• Superconductor-Insulator Phase Separation Induced by Rapid Cooling in kappa-(ET)_2Cu[N(CN)_2]Br
• Nematicity from mixed S_{+-} + d_{x^2-y^2} states in iron-based superconductors
• Temperature and filling dependence of the superconducting $\pi$-phase in the Penson-Kolb-Hubbard model
• Theory of Charge Kondo Effect on Pair Hopping Mechanism
• Metastability and phase separation in a simple model of a superconductor with extremely short coherence length
• Some properties of two dimensional extended repulsive Hubbard model with intersite magnetic interactions - a Monte Carlo study
• Superconductivity, metastability and magnetic field induced phase separation in the atomic limit of the Penson-Kolb-Hubbard model
• Temperature dependence of iron local magnetic moment in phase-separated superconducting chalcogenide
• GPU-based acceleration of free energy calculations in solid state physics
• The magnetic field induced phase separation in a model of a superconductor with local electron pairing
• Pair supersolid of the extended Bose-Hubbard model with atom-pair hopping on the triangular Lattice
• Efficient Selfconsistent Calculations of Multiband Superconductivity in UPd${}_2$Al${}_3$
• Probe-type of superconductivity by impurity in materials with short coherence length: the s-wave and $\eta$-wave phases study
• The Fermion-ladder Models: Extensions of the Hubbard Model with $\eta$-pairing
• Upper critical field divergence induced by mesoscopic phase separation in the organic superconductor (TMTSF)2ReO4
• Hund and pair-hopping signature in transport properties of degenerate nanoscale devices

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