Spin-triplet paired phases inside ferromagnet induced by Hund's rule coupling and electronic correlations: Application to ${\mathrm{UGe}}_2$

Abstract

We discuss a mechanism of real-space spin-triplet pairing, alternative to that due to quantum paramagnon excitations, and demonstrate its applicability to $\mathrm{UG}{\mathrm{e}}_2$. Both the Hund's rule ferromagnetic exchange and inter-electronic correlations contribute to the same extent to the equal-spin pairing, particularly in the regime in which the weak-coupling solution does not provide any. The theoretical results, obtained within the orbitally-degenerate Anderson lattice model, match excellently the observed phase diagram for $\mathrm{UG}{\mathrm{e}}_2$ with the coexistent ferromagnetic (FM1) and superconducting ($A_1$-type) phase. Additionally, weak $A_2$- and $A$-type paired phases appear in very narrow regions near the metamaganetic (FM2 $\to$ FM1) and FM1 $\to$ paramagnetic first-order phase-transition borders, respectively. The values of magnetic moments in the FM2 and FM1 states are also reproduced correctly in a semiquantitative manner. The Hund's metal regime is also singled out as appearing near FM1-FM2 boundary.

References in corpus (31)

• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Superconducting phases of f-electron compounds
• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• The Physics Behind High-Temperature Superconducting Cuprates: The "Plain Vanilla" Version Of RVB
• p-wave and d-wave superconductivity in quasi-two-dimensional metals
• Pressure dependence of the magnetization in the ferromagnetic superconductor UGe_2
• Magnetism, Spin-Orbit Coupling, and Superconducting Pairing in UGe${}_2$
• Ferromagnetism and Superconductivity in Uranium Compounds
• Superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe
• Even Parity, Orbital Singlet and Spin Triplet Pairing for Superconducting $La(O_{1-x}{F}_x)FeAs$
• Ferromagnetic superconductivity driven by changing Fermi surface topology
• Superconductivity from emerging magnetic moments
• Variational study of Fermi-surface deformations in Hubbard models
• Universal properties of high temperature superconductors from real space pairing: t-J-U model and its quantitative comparison with experiment
• Renormalized mean-field t-J model of high-Tc superconductivity: comparison with experiment
• Unconventional Superconductivity from Local Spin Fluctuations in the Kondo Lattice
• Spin-triplet s-wave local pairing induced by Hund's rule coupling
• Heat-capacity anomalies at $T_{sc}$ and $T^{\ast }$ in the ferromagnetic superconductor UGe${}_2$
• Spin-triplet superconducting pairing due to local (Hund's rule, Dirac) exchange
• Itinerant ferromagnetism in actinide 5f electrons system: Phenomenological analysis with spin fluctuation theory
• High temperature superconductivity in the two-dimensional $t$-$J$ model: Gutzwiller wave function solution
• Ferromagnetism in UGe2 : A microscopic model
• Even-parity spin-triplet pairing for orbitally degenerate correlated electrons by purely repulsive interactions
• Evidence for ferromagnetic spin-pairing superconductivity in UGe${}_2$: A ${}^{73}$Ge-NQR study under pressure
• Coexistence of spin-triplet superconductivity with magnetism within a single mechanism for orbitally degenerate correlated electrons: Statistically-consistent Gutzwiller approximation
• d-wave superconductivity in the frustrated two-dimensional periodic Anderson model
• Correlation-driven multigap d-wave superconductivity in Anderson lattice model
• Criticalities in the itinerant ferromagnet UGe${}_2$
• Electronic structure of UGe${}_2$ at ambient pressure: comparison with X-ray photoemission spectra
• Tricritical wings in UGe${}_2$: A microscopic interpretation
• Coexistence of spin-triplet superconductivity and ferromagnetism induced by the Hund's rule exchange

Cited by in corpus (11)

• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Unconventional topological superconductivity and phase diagram for an effective two-orbital model as applied to twisted bilayer graphene
• Superconductivity in high-$T_c$ and related strongly correlated systems from variational perspective: Beyond mean field theory
• Mechanism for transitions between ferromagnetic and antiferromagnetic orders in $d$-electron metallic magnets
• Interplay between band structure and Hund's correlation to increase T${}_c$ in FeSe
• Odd-Parity Spin-Triplet Superconductivity in Centrosymmetric Antiferromagnetic Metals
• Coexistent spin-triplet superconducting and ferromagnetic phases induced by the Hund's rule coupling and electronic correlations II: Effect of applied magnetic field
• Universal collective modes from strong electronic correlations: Modified $1/{\mathcal{N}}_f$ theory with application to high-$T_c$ cuprates
• Extending the Gutzwiller approximation to intersite interactions
• Superconducting Correlations in the One-Dimensional Kondo Lattice Models under Magnetic Fields
• Spatially modulated, orbital selective ferromagnetism in La${}_5$Co${}_2$Ge${}_3$