Electronic Structure of UTe<sub>2</sub> Studied by Photoelectron Spectroscopy

Fujimori, Shin–ichi; Kawasaki, Ikuo; Takeda, Yukiharu; Yamagami, Hiroshi; Nakamura, Ai; Homma, Yoshiya; Aoki, Dai

doi:10.7566/jpsj.88.103701

Cited by 54 publications

(76 citation statements)

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“…However, the previously obtained result shows an insulating state with a small gap of 13 meV, which contradicts metallic behaviors in electric resistivity [1,5]. On the other hand, small FSs appear in another firstprinciples band calculation using the relativistic linearized augmented plane wave method [22]. This is also incompatible with transport measurements [23] indicating a large carrier density, as well as their angle-resolved photoemission spectroscopy (ARPES) detecting large intensities around the R point at the Fermi level [22].…”

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confidence: 89%

“…On the other hand, small FSs appear in another firstprinciples band calculation using the relativistic linearized augmented plane wave method [22]. This is also incompatible with transport measurements [23] indicating a large carrier density, as well as their angle-resolved photoemission spectroscopy (ARPES) detecting large intensities around the R point at the Fermi level [22]. These discrepancies between naive band structure calculations and experiments imply that the Coulomb interaction is crucially important for UTe 2 .…”

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confidence: 94%

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Insulator-Metal Transition and Topological Superconductivity in UTe2 from a First-Principles Calculation

et al. 2019

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We theoretically study superconductivity in UTe2, which is a recently discovered strong candidate for an oddparity spin-triplet superconductor. Theoretical studies for this compound faced difficulty because first-principles calculations predict an insulating electronic state, incompatible with superconducting instability. To overcome this problem, we take into account electron correlation effects by a GGA+U method and show the insulatormetal transition by Coulomb interaction. Using Fermi surfaces obtained as a function of U , we clarify topological properties of possible superconducting states. Fermi surface formulas for the three-dimensional winding number and three two-dimensional Z2 numbers indicate topological superconductivity at an intermediate U for all the odd-parity pairing symmetry in the Immm space group. Symmetry and topology of superconducting gap nodes are analyzed and the gap structure of UTe2 is predicted. Topologically protected low-energy excitations are highlighted, and experiments by bulk and surface probes are proposed to link Fermi surfaces and pairing symmetry. Based on the results, we also discuss multiple superconducting phases under magnetic fields, which were implied by recent experiments. arXiv:1908.04004v3 [cond-mat.supr-con] 1 Nov 2019

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confidence: 89%

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Insulator-Metal Transition and Topological Superconductivity in UTe2 from a First-Principles Calculation

et al. 2019

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“…The recent discovery of unconventional superconductivity (SC) in the uranium chalcogenide paramagnet UTe 2 with a superconducting transition temperature of T SC ∼ 1.6 K [1][2][3] opens new perspectives on superconducting topological properties including emergent Majorana quasiparticles at the verge of magnetic and electronic instability. Transport and thermodynamic measurements demonstrated that correlations play an important role in this system, requiring theoretical treatment beyond the local-density approximation approach [2,[4][5][6][7][8]. The closeness of UTe 2 to ferromagnetic quantum criticality [9] induces astonishing superconducting properties.…”

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confidence: 99%

Evidence of Fermi surface reconstruction at the metamagnetic transition of the strongly correlated superconductor UTe2

Niu

Knebel

Braithwaite

et al. 2020

Phys. Rev. Research

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Thermoelectric power (S) and Hall effect (R H) measurements on the paramagnetic superconductor UTe 2 with the magnetic field applied along the hard magnetization b axis are reported. The first-order nature of the metamagnetic transition at H m = H b c2 = 35 T leads to drastic consequences on S and R H. In contrast to the field dependence of the specific heat in the normal state through H m , S(H) is not symmetric with respect to H m. This implies a strong interplay between ferromagnetic fluctuations and a Fermi-surface reconstruction at H m. R H is very well described by incoherent skew scattering above the coherence temperature T m corresponding roughly to the temperature of the maximum in the susceptibility T χmax and coherent skew scattering at lower temperatures. The discontinuous field dependence of both S(H) and the ordinary Hall coefficient R 0 , at H m and at low temperature, provides evidence of a change in the band structure at the Fermi level.

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“…A theoretical study based on the periodic Anderson model verified this naive expectation and predicted the parity-mixed superconducting state in the intermediate pressure region 25 . Note that the interband pairing, which is an essential ingredient for the asymmetric BS and anapole superconductivity, may have considerable impacts on the superconductivity in UTe 2 owing to multiple bands near the Fermi level 25,[80][81][82][83][84][85][86] .…”

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confidence: 99%

Anapole superconductivity from $${{{{{{{\mathcal{PT}}}}}}}}$$-symmetric mixed-parity interband pairing

Kanasugi

Yanase

2022

Commun Phys

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Recently, superconductivity with spontaneous time-reversal or parity symmetry breaking is attracting much attention owing to its exotic properties, such as nontrivial topology and nonreciprocal transport. Particularly fascinating phenomena are expected when the time-reversal and parity symmetry are simultaneously broken. This work shows that time-reversal symmetry-breaking mixed-parity superconducting states generally exhibit an unusual asymmetric Bogoliubov spectrum due to nonunitary interband pairing. For generic two-band models, we derive the necessary conditions for the asymmetric Bogoliubov spectrum. We also demonstrate that the asymmetric Bogoliubov quasiparticles lead to the effective anapole moment of the superconducting state, which stabilizes a nonuniform Fulde-Ferrell-Larkin-Ovchinnikov state at zero magnetic fields. The concept of anapole order employed in nuclear physics, magnetic materials science, strongly correlated electron systems, and optoelectronics is extended to superconductors by this work. Our conclusions are relevant for any multiband superconductors with competing even- and odd-parity pairing channels. Especially, we discuss the superconductivity in UTe2.

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Electronic Structure of UTe₂ Studied by Photoelectron Spectroscopy

Cited by 54 publications

References 11 publications

Insulator-Metal Transition and Topological Superconductivity in UTe2 from a First-Principles Calculation

Insulator-Metal Transition and Topological Superconductivity in UTe2 from a First-Principles Calculation

Evidence of Fermi surface reconstruction at the metamagnetic transition of the strongly correlated superconductor UTe2

Anapole superconductivity from $${{{{{{{\mathcal{PT}}}}}}}}$$-symmetric mixed-parity interband pairing

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Electronic Structure of UTe2 Studied by Photoelectron Spectroscopy

Cited by 54 publications

References 11 publications

Insulator-Metal Transition and Topological Superconductivity in UTe2 from a First-Principles Calculation

Insulator-Metal Transition and Topological Superconductivity in UTe2 from a First-Principles Calculation

Evidence of Fermi surface reconstruction at the metamagnetic transition of the strongly correlated superconductor UTe2

Anapole superconductivity from $${{{{{{{\mathcal{PT}}}}}}}}$$-symmetric mixed-parity interband pairing

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Electronic Structure of UTe₂ Studied by Photoelectron Spectroscopy