Dimensionality driven enhancement of ferromagnetic superconductivity in URhGe

Abstract

In most unconventional superconductors, like the high-Tc cuprates, iron pnictides, or heavy fermion systems, superconductivity emerges in the proximity of an electronic instability. Identifying unambiguously the pairing mechanism remains nevertheless an enormous challenge. Among these systems, the orthorhombic uranium ferromagnetic superconductors have a unique position, notably because magnetic fields couple directly to ferromagnetic order, leading to the fascinating discovery of the re-emergence of superconductivity in URhGe at high field. Here we show that uniaxial stress is a remarkable tool allowing fine-tuning of the pairing strength. With a relatively small stress, the superconducting phase diagram is spectacularly modified, with a merging of the low and high field superconducting states and a significant enhancement of superconductivity. The superconducting critical temperature increases both at zero field and under field, reaching 1K, more than twice higher than at ambient pressure. The enhancement of superconductivity is directly related to a change of the magnetic dimensionality with an increase of the transverse magnetic susceptibility, demonstrating that in addition to the Ising-type longitudinal ferromagnetic fluctuations, transverse magnetic fluctuations also play an important role in the superconducting pairing.

References in corpus (10)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Strong Peak in $T_c$ of Sr${}_2$RuO${}_4$ Under Uniaxial Pressure
• Quantum critical effects on transition temperature of magnetically mediated p-wave superconductivity
• Strong Enhancement of Superconducting T_c in Ferromagnetic Phases
• Microscopic Coexistence of Ferromagnetism and Superconductivity in Single-Crystal UCoGe
• Superconductivity in Uranium Ferromagnets
• Muon spin rotation and relaxation in the superconducting ferromagnet UCoGe
• Properties of Ferromagnetic Superconductors
• Superconductivity Reinforced by Magnetic Field and the Magnetic Instability in Uranium Ferromagnets
• Pressure Evolution of the Ferromagnetic and Field Re-entrant Superconductivity in URhGe

Cited by in corpus (24)

• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Field-reentrant superconductivity close to a metamagnetic transition in the heavy-fermion superconductor UTe${}_2$
• Multiple superconducting phases in a nearly ferromagnetic system
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Comparison of two superconducting phases induced by a magnetic field in UTe2
• Theory of spin-polarized superconductors -- an analogue of superfluid ${}^3$He A-phase
• Effects of Lifshitz transitions in ferromagnetic superconductors: the case of URhGe
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Non-unitary triplet superconductivity tuned by field-controlled magnetization --URhGe, UCoGe and UTe${}_2$--
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• Strong correlation between ferromagnetic superconductivity and pressure-enhanced ferromagnetic fluctuations in UGe${}_2$
• Spin-triplet superconductivity in the paramagnetic UCoGe under pressure studied by ${}^{59}$Co NMR
• High-Pressure Phase Diagram of NdFeAsO${}_{0.9}$F${}_{0.1}$: Disappearance of superconductivity on the verge of ferromagnetism from nd moments
• Novel critical behavior of magnetization in URhSi:Similarities to uranium ferromagnetic superconductors UGe${}_2$ and URhGe
• Vortex liquid phase in the p-wave ferromagnetic superconductor UCoGe
• Metamagnetic phase transition in ferromagnetic superconductor URhGe
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• Theoretical studies on off-axis phase diagrams and Knight shifts in UTe${}_2$ -- Tetra-critical point, d-vector rotation, and multiple phases
• Piezomagnetism in the Ising ferromagnet URhGe
• Localization of 5f-electrons and pressure effects on magnetism in U intermetallics in the light of spin-fluctuation theory
• High-field moment polarization in the itinerant ferromagnet URhSi
• Novel universality class for the ferromagnetic transition in the low carrier concentration systems UTeS and USeS exhibiting large negative magnetoresistance
• Metamagnetism and tricriticalilty in heavy-fermion ferromagnet URhGe
• Magnetoelastic coupling at the field-induced transition in EuAl${}_{12}$O${}_{19}$