Quantum Criticality in the Ferromagnetic Superconductor UCoGe under Pressure and Magnetic Field

Abstract

The pressure-temperature phase diagram of the orthorhombic ferromagnetic superconductor UCoGe was determined by resistivity measurements up to $10.5$GPa. The Curie temperature $T_C$ is suppressed with pressure and vanishes at the critical pressure $p_c\approx 1$GPa. Superconductivity is observed in both the ferromagnetic state at low pressure, and in the paramagnetic state above $p_c$ up to about 4 GPa. Non-Fermi liquid behavior appears in a large pressure range. The resistivity varies linearly with temperature around $p_c$ and evolves continuously with pressure to a $T^2$ Fermi-liquid behavior for $p⪆5$~GPa. The residual resistivity as a function of pressure shows a maximum far above $p_c$ at $p^{\star }=7.2$GPa and the amplitude of the inelastic scattering term of the resistivity decreases by more than one order in magnitude at $p^{\star }$, which appears to mark the entrance into a weakly correlated regime. The pressure dependence of the upper critical field for magnetic field applied along the $b$ and $c$ axis illustrates the drastic difference in the field dependence of the ferromagnetic superconducting pairing. While for $H\parallel b$ axis $H_{c2}(T)$ is driven by the suppression of the ferromagnetic order, it is dominated by the strong initial suppression of the ferromagnetic fluctuations for a field applied in the easy magnetization axis $c$.

arXiv comment6 pages, 4 figures, accepted for publication in Phys. Rev. B

References in corpus (42)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Nematic order in iron superconductors - who is in the driver's seat?
• Superconducting phases of f-electron compounds
• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Magnetic-Field Induced Quantum Critical Point in YbRh${}_2$Si${}_2$
• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• Superconductivity and Quantum Criticality in CeCoIn_5
• Signatures of valence fluctuations in CeCu2Si2 under high pressure
• Linear-T resistivity and change in Fermi surface at the pseudogap critical point of a high-Tc superconductor
• Critical fermi surfaces and non-fermi liquid metals
• Pressure dependence of the magnetization in the ferromagnetic superconductor UGe_2
• Correlation between linear resistivity and $T_c$ in the Bechgaard salts and the pnictide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Inhomogeneous phase formation on the border of itinerant ferromagnetism
• Quantum-critical behavior of itinerant ferromagnets
• A mechanism for the non-Fermi-liquid behavior in CeCu_{6-x}Au_x
• Tricritical behavior in itinerant quantum ferromagnets
• Extremely Large and Anisotropic Upper Critical Field and the Ferromagnetic Instability in UCoGe
• Superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe
• The quantum critical point in CeRhIn_5: a resistivity study
• Unusual upper critical field of the ferromagnetic superconductor UCoGe
• Enhancement of superconductivity near the ferromagnetic quantum critical point in UCoGe
• Thermal and Electrical Transport across a Magnetic Quantum Critical Point
• Spin-fluctuation dominated electrical transport of Ni3Al at high pressure
• Pressure-temperature Phase Diagram of Polycrystalline UCoGe Studied by Resistivity Measurement
• Microscopic Coexistence of Ferromagnetism and Superconductivity in Single-Crystal UCoGe
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• Quantum order-by-disorder driven phase reconstruction in the vicinity of ferromagnetic quantum critical points
• Superconductivity Reinforced by Magnetic Field and the Magnetic Instability in Uranium Ferromagnets
• Electronic Structure of Heavy Fermion Uranium Compounds Studied by Core-Level Photoelectron Spectroscopy
• Properties of Ferromagnetic Superconductors
• Unconventional Quantum Criticality due to Critical Valence Transition
• Collapse of ferromagnetism and Fermi surface instability near reentrant superconductivity of URhGe
• Unconventional Strong Spin-Fluctuation Effects around the Critical Pressure of the Itinerant Ising-Type Ferromagnet URhAl
• Electronic structures of ferromagnetic superconductors ${\mathrm{UGe}}_2$ and $\mathrm{UCoGe}$ studied by angle-resolved photoelectron spectroscopy
• Probing the extended non-Fermi liquid regimes of MnSi and Fe
• Paramagnetic limiting in ferromagnetic superconductors with triplet pairing
• Superconductivity in Uranium Compounds
• Equivalence of single-particle and transport lifetimes from hybridization fluctuations
• Pressure-phase diagram of UCoGe by ac-susceptibility and resistivity measurements
• Pressure-temperature phase diagram of ferromagnetic superconductors
• On the phase diagram of UGe2
• Existence of Anisotropic Spin Fluctuations at Low Temperature in the Normal Phase of the Superconducting Ferromagnet UCoGe

Cited by in corpus (20)

• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Unconventional Superconductivity in UTe2
• 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
• Indication of Ferromagnetic Quantum Critical Point in Kondo Lattice CeRh${}_6$Ge${}_4$
• Anomalous Anisotropy of the Lower Critical Field and Meissner Effect in UTe2
• Critical behavior of magnetization in URhAl:Quasi-two-dimensional Ising system with long-range interactions
• Phase diagram of UCoGe
• 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
• Enhancement of superconductivity by pressure-induced critical ferromagnetic fluctuations in UCoGe
• Effect of Pressure on Magnetism of UIrGe
• Pairing interaction in superconducting UCoGe tunable by magnetic field
• Current induced magnetization dynamics and magnetization switching in superconducting ferromagnetic hybrid (F$|$S$|$F) structures
• Single ferromagnetic fluctuations in UCoGe revealed by 73Ge- and 59Co-NMR studies
• Localization of 5f-electrons and pressure effects on magnetism in U intermetallics in the light of spin-fluctuation theory
• Superconductivity at the Pressure-Induced Ferromagnetic Critical Region in UCoGe
• Superconducting and ferromagnetic phase diagram of UCoGe probed by thermal expansion