Electronic structure of UTe${}_2$ under pressure

Abstract

A heavy-fermion paramagnet UTe${}_2$ has been a strong candidate for a spin-triplet superconductor. Experiments on UTe${}_2$ under pressure have been vigorously conducted, and rich phase diagrams have been suggested. Multiple superconducting phases exist in the pressure region of $0\le P<1.8\mathrm{GPa}$, and an antiferromagnetic ordered state is observed in the high pressure region $P>1.8\mathrm{GPa}$. However, under pressure, the underlying electronic structure in the normal state has not been clarified, although knowledge of electronic structures is essential for studying magnetic and superconducting states. As an indispensable step toward understanding the phase diagram of UTe${}_2$, we study the electronic structure under hydrostatic and uniaxial stresses based on the density functional theory with and without employing structural optimization. It is shown that the low-energy band structure and Fermi surfaces are not sensitive to pressure for parameters where itinerant $f$-electrons are not essential. However, we find a significant pressure dependence for a certain Coulomb interaction $U$ of the GGA+$U$ calculation, where the large weight of $f$-electrons appears at the Fermi level. An increase in the density of states at the Fermi level is observed under pressure, which is attributed to compressive stress along the [010] crystallographic axis.

References in corpus (44)

• Spontaneously polarized half-gapped superconductivity
• Majorana Fermions and Topology in Superconductors
• Unconventional Superconductivity in Heavy Fermion UTe2
• Anisotropy and Magnetism in the LSDA+U Method
• Unconventional Superconductivity in UTe2
• Multiple superconducting phases in a nearly ferromagnetic system
• Coexistence of ferromagnetic fluctuations and superconductivity in the actinide superconductor UTe2
• Insulator-metal transition and topological superconductivity in UTe2 from a first-principles calculation
• Evidence for a pressure-induced antiferromagnetic quantum critical point in intermediate valence UTe2
• Multiple Superconducting Phases and Unusual Enhancement of the Upper Critical Field in UTe2
• Quasi-two-dimensional Fermi surfaces and unitary spin-triplet pairing in the heavy fermion superconductor UTe${}_2$
• Low energy band structure and symmetries of UTe2 from angle resolved photoemission spectroscopy
• Incommensurate Spin Fluctuations in the Spin-triplet Superconductor Candidate UTe${}_2$
• 125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
• Periodic Anderson model for magnetism and superconductivity in UTe2
• First Observation of de Haas-van Alphen Effect and Fermi Surfaces in Unconventional Superconductor UTe2
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• Enhanced spin triplet superconductivity due to Kondo destabilization
• Chiral superconductivity in UTe2 probed by anisotropic low-energy excitations
• Anisotropy of the Upper Critical Field in the Heavy-Fermion Superconductor UTe2 under Pressure
• Quasi-2D Fermi surface in the anomalous superconductor UTe2
• Tuning magnetic confinement of spin-triplet superconductivity
• Single-Component Superconductivity in UTe${}_2$ at Ambient Pressure
• $c$-axis transport in UTe${}_2$: Evidence of Three Dimensional Conductivity Component
• A review of UTe${}_2$ at high magnetic fields
• Revealing a 3D Fermi Surface Pocket and Electron-Hole Tunneling in UTe${}_2$ with Quantum Oscillations
• Fully gapped pairing state in spin-triplet superconductor UTe${}_2$
• Anapole superconductivity from $\mathcal{P}\mathcal{T}$-symmetric mixed-parity interband pairing
• Field-Induced Superconductivity near the Superconducting Critical Pressure in UTe2
• Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe${}_2$
• Quantum-geometry-induced anapole superconductivity
• Quantum interference between quasi-2D Fermi surface sheets in UTe2
• Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases of UTe2
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
• Magnetic reshuffling and feedback on superconductivity in UTe2 under pressure
• Thermodynamic and electrical transport properties of UTe${}_2$ under uniaxial stress
• de Haas-van Alphen Oscillations for the Field Along c-axis in UTe2
• Pressure-induced structural phase transition and new superconducting phase in UTe2
• Pairing symmetries of multiple superconducting phases in UTe2: Competition between ferromagnetic and antiferromagnetic fluctuations
• Piezoelectric effect and diode effect in anapole and monopole superconductors
• Thermodynamic transitions and topology of spin-triplet superconductivity: Application to UTe${}_2$
• Resonant Ultrasound Spectroscopy for Irregularly-Shaped Samples and its Application to Uranium Ditelluride
• Incommensurate antiferromagnetism in UTe2 under pressure