Superconductivity and Ferromagnetic Quantum Criticality in Uranium Compounds

Abstract

We review our recent studies on ferromagnetic superconductors, UGe2, URhGe and UCoGe, together with the ferromagnetic quantum criticality and paramagnetic singularity on the Ising 5f-itinerant system UCoAl. Thanks to the variety of ordered moment in ferromagnetic superconductors from 1.5 muB to 0.05 muB, interesting systematic changes or similarities are clarified. All ferromagnetic superconductors show large upper critical field Hc2, and the field-reentrant (-reinforced) phenomena are observed in the field-temperature phase diagram, when the pressure or field direction is tuned for particular conditions. These phenomena are well explained by the ferromagnetic longitudinal fluctuations, which are induced by the magnetic field in transverse configurations. The large Hc2 might be also associated with possible additional effects of Fermi surface instabilities, such as Lifshitz-type singularities.

8 pages, 13 figures, accepted for publication in J. Phys. Soc. Jpn. Special Topics

References in corpus (8)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Tricritical point and wing structure in the itinerant ferromagnet UGe2
• Heavy fermions in high magnetic field
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• Properties of Ferromagnetic Superconductors
• Absence of Meissner State and Robust Ferromagnetism in the Superconducting State of UCoGe: Possible Evidence of Spontaneous Vortex State
• Ferromagnetic Quantum Criticality Studied by Hall Effect Measurements in UCoAl
• Spin Susceptibility in the Superconducting state of Ferromagnetic Superconductor UCoGe

Cited by in corpus (43)

• Metallic Quantum Ferromagnets
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Insulator-metal transition and topological superconductivity in UTe2 from a first-principles calculation
• Frustrated magnet for adiabatic demagnetization cooling to milli-Kelvin temperatures
• 125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
• Superconductivity in Uranium Ferromagnets
• Classification of topological crystalline superconducting nodes on high-symmetry lines: Point nodes, line nodes, and Bogoliubov Fermi surfaces
• Superconductivity in high-$T_c$ and related strongly correlated systems from variational perspective: Beyond mean field theory
• $Z_4$ Topological Superconductivity in UCoGe
• Itinerant ferromagnetism in actinide 5f electrons system: Phenomenological analysis with spin fluctuation theory
• Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors : An application to CeRh${}_2$As${}_2$
• Lifshitz Transitions in the Ferromagnetic Superconductor UCoGe
• Reentrant superconductivity in URhGe
• Effects of Lifshitz transitions in ferromagnetic superconductors: the case of URhGe
• Wing structure in the phase diagram of the Ising Ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements
• Fermi Surface Instabilities in Ferromagnetic Superconductor URhGe
• Compact AC Susceptometer for Fast Sample Characterization down to 0.1 K
• Magnetism and Superconductivity in Ferromagnetic Heavy Fermion System UCoGe under In-plane Magnetic Fields
• Superconductivity in Uranium Compounds
• Switching of magnetic ground states across the UIr1-xRhxGe alloy system
• Topological properties of ferromagnetic superconductors
• Phase diagram of UCoGe
• Circuit QED detection of induced two-fold anisotropic pairing in a hybrid superconductor-ferromagnet bilayer
• Magnetic response of Majorana Kramers pairs with an order-two symmetry
• Magnetic Response of Majorana Kramers Pairs Protected by Z2 Invariants
• Spin-triplet superconductivity in the paramagnetic UCoGe under pressure studied by ${}^{59}$Co NMR
• Superconducting Gap of UCoGe probed by Thermal Transport
• Vortex liquid phase in the p-wave ferromagnetic superconductor UCoGe
• Pairing interaction in superconducting UCoGe tunable by magnetic field
• Coexisting Kondo hybridization and itinerant f-electron ferromagnetism in UGe2
• Single ferromagnetic fluctuations in UCoGe revealed by 73Ge- and 59Co-NMR studies
• Theory of type-II superconductivity in ferromagnetic metals with triplet pairing
• Superconductivity in the Ferromagnet URhGe under uniaxial pressure
• Superconducting and ferromagnetic phase diagram of UCoGe probed by thermal expansion
• Triplet superconductivity in ferromagnets due to magnon exchange
• Anisotropic spin-current spectroscopy of ferromagnetic superconducting gap symmetries
• Anomalous Field-Temperature Phase Diagram of Superconductivity in Sn-Pb Solder
• Majorana multipole response with magnetic point group symmetry
• Suppression of superconductivity and structural phase transition against pressure in Ca${}_{10}$(Ir${}_4$As${}_8$)(Fe${}_{2-x}$Ir${}_x$As${}_2$)${}_5$
• Valence instability across magnetostructural transition in USb${}_2$
• Electron-beam Floating-zone Refined UCoGe
• Phenomenological theory in reentrant uranium-based superconductors
• Field-angular Dependence of Pairing Interaction in URhGe: Comparison with UCoGe