Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2

Abstract

We performed AC calorimetry and magnetoresistance measurements under pressure for H || a-axis (easy-magnetization axis) in the novel heavy-fermion superconductor UTe2. Thanks to the thermodynamic information, multiple superconducting phases have been revealed under pressure and magnetic field. The (H,T) phase diagram of superconductivity under pressure displays an abrupt increase of the upper critical field (Hc2) at low temperature and in the high field region, and a strong convex curvature of Hc2 at high temperature. This behavior of Hc2 and the multiple superconducting phases require a state for the superconducting order parameter more complex than a spin-triplet equal spin pairing. Above the superconducting critical pressure, Pc, we find strong indications that the possible magnetic order is closer to antiferromagnetism than to ferromagnetism.

arXiv comment6 pages, 5 figures, accepted for publication in J. Phys. Soc. Jpn

References in corpus (27)

• Spontaneously polarized half-gapped superconductivity
• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Microscopic evidence for a chiral superconducting order parameter in the heavy fermion superconductor UTe2
• Unconventional Superconductivity in Heavy Fermion UTe2
• Extreme magnetic field-boosted superconductivity
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Ferromagnetism and Superconductivity in Uranium Compounds
• Extremely Large and Anisotropic Upper Critical Field and the Ferromagnetic Instability in UCoGe
• Multiple superconducting phases in a nearly ferromagnetic system
• Coexistence of ferromagnetic fluctuations and superconductivity in the actinide superconductor UTe2
• Metamagnetic Transition in Heavy Fermion Superconductor UTe2
• Insulator-metal transition and topological superconductivity in UTe2 from a first-principles calculation
• Point Node Gap Structure of Spin-Triplet Superconductor UTe2
• Superconducting Properties of Heavy Fermion UTe${}_2$ Revealed by ${}^{125}$Te-Nuclear Magnetic Resonance
• Quasi-two-dimensional Fermi surfaces and unitary spin-triplet pairing in the heavy fermion superconductor UTe${}_2$
• Evidence for an FFLO state with segmented vortices in the BCS-BEC-crossover superconductor FeSe
• 125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
• Thermodynamic evidence for the Fulde-Ferrell-Larkin-Ovchinnikov state in the KFe2As2 superconductor
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe${}_2$
• Valence and magnetic ordering in intermediate valence compounds : TmSe versus SmB6
• Fermi-Surface Instabilities in the Heavy-Fermion Superconductor UTe2
• Ferromagnetic Mixed-Valence and Kondo-Lattice State in TmTe at High Pressure
• Quasiparticle Excitations and Evidence for Superconducting Double Transitions in Monocrystalline U0.97Th0.03Be13
• Theory of spin-polarized superconductors -- an analogue of superfluid ${}^3$He A-phase
• Three-dimensional critical phase diagram of the Ising antiferromagnet CeRh${}_2$Si${}_2$ under intense magnetic field and pressure
• Spin-Triplet Superconductivity in UTe2 and Ferromagnetic Superconductors

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• Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations
• Spatially inhomogeneous superconductivity in UTe2
• Orientation of point nodes and nonunitary triplet pairing tuned by the easy-axis magnetization in UTe2
• Topological crystalline superconductivity in locally noncentrosymmetric CeRh${}_2$As${}_2$
• Comparison of two superconducting phases induced by a magnetic field in UTe2
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• Single-Component Superconductivity in UTe${}_2$ at Ambient Pressure
• A review of UTe${}_2$ at high magnetic fields
• Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2
• Field-Induced Superconductivity near the Superconducting Critical Pressure in UTe2
• Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
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• Nonreciprocal optical response in parity-breaking superconductors
• Inhomogeneous Superconducting State Probed by ${}^{125}$Te NMR on UTe$_2
• Decoupling multi-phase superconductivity from normal state ordering in CeRh${}_2$As${}_2$
• Discovery of magnetic phase transitions in heavy-fermion superconductor CeRh${}_2$As${}_2$
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• Anisotropic magnetotransport properties of the heavy-fermion superconductor CeRh${}_2$As${}_2$
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• Expansion of the high field-boosted superconductivity in UTe2 under pressure
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• Piezoelectric effect and diode effect in anapole and monopole superconductors
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• Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe${}_2$
• Multiple superconducting phases in heavy-fermion metals
• Superconducting piezoelectric effect
• Metastable phase of UTe${}_2$ formed under high pressure above 5 GPa
• Notes on multiple superconducting phases in UTe${}_2$ ---Third transition---
• Absence of a Bulk Thermodynamic Phase Transition to a Density Wave Phase in UTe2
• Resonant Ultrasound Spectroscopy for Irregularly-Shaped Samples and its Application to Uranium Ditelluride
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• Quasi-uniaxial pressure induced superconductivity in stoichiometric compound UTe${}_2$
• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
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