Enhanced spin triplet superconductivity due to Kondo destabilization

Abstract

In a Kondo lattice system, suppression of effective Kondo coupling leads to the breakdown of the heavy-electron metal and a change in the electronic structure. Spin triplet superconductivity in the Kondo lattice UTe2 appears to be associated with spin fluctuations originating from incipient ferromagnetic order. Here we show clear evidence of twofold enhancement of spin-triplet superconductivity near the pressure-driven suppression of the Kondo coherence, implying that superconductivity is strengthened by the affiliated growth of both spin and charge fluctuations. The coherent Kondo state discontinuously transitions to ferromagnetic order at higher pressures. Application of magnetic field tunes the system back across a first-order phase boundary. Straddling this phase boundary, we find another example of reentrant superconductivity in UTe2. In addition to spin fluctuations associated with ferromagnetism, our results show that a Kondo-driven Fermi surface instability may be playing a role in stabilizing spin triplet superconductivity.

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• Topological crystalline superconductivity in locally noncentrosymmetric CeRh${}_2$As${}_2$
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• A review of UTe${}_2$ at high magnetic fields
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• Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2
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• Inhomogeneous Superconducting State Probed by ${}^{125}$Te NMR on UTe$_2
• Quantum-geometry-induced anapole superconductivity
• Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases of UTe2
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
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• Resonant Ultrasound Spectroscopy for Irregularly-Shaped Samples and its Application to Uranium Ditelluride
• Quasiperiodic criticality and spin-triplet superconductivity in superconductor-antiferromagnet moire patterns
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• Incommensurate antiferromagnetism in UTe2 under pressure
• Quasi-uniaxial pressure induced superconductivity in stoichiometric compound UTe${}_2$
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• Majorana multipole response with magnetic point group symmetry
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• Reciprocal and nonreciprocal paraconductivity in bilayer multiphase superconductors
• Higher-order topological phases for time-reversal-symmetry breaking superconductivity in UTe${}_2$
• Magnetic fluctuations and anisotropy in UTe2: a multi-orbital study based on GGA+U and RPA
• Electronic structure of UTe${}_2$ under pressure
• Light Control of Triplet Pairing in Correlated Electrons with Mixed-Sign Interactions
• Theoretical Study of Impurity Effects on Superconductivity in UTe2
• Spin-lattice relaxation for point-node-like s-wave superconductivity in f-electron systems