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Article
Physics, Multidisciplinary
Tamaghna Hazra et al.
Summary: Observing a common structural motif in several U and Ce based candidate triplet superconductors, where pairs of magnetic atoms are separated by an inversion center, we propose a unique triplet pairing mechanism based on an interplay of Hund's and Kondo interactions. Hund's interactions generate valence fluctuations, leading to a triplet superexchange between electrons and local moments. The resulting Kondo effect allows spin-triplet pairs to delocalize onto the Fermi surface, triggering superconductivity. We demonstrate this mechanism using a minimal two-channel Kondo lattice model and provide support from existing experiments.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Fabrice Wilhelm et al.
Summary: This article investigates the electronic structure of UTe2 through two types of X-ray spectroscopy, revealing unusual features and pressure dependence of the 5f electron count. This understanding is crucial for fully comprehending its superconducting properties.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Condensed Matter
Y. Haga et al.
Summary: Single crystals of the unconventional superconductor UTe2 have been grown under different conditions, resulting in different superconducting transition temperatures and normal state properties. The stoichiometry of the samples has been accurately characterized, with the superconducting samples being nearly stoichiometric and the non-superconducting sample deviating significantly. The superconducting UTe2 exhibits partially gapped large density of states in the normal state, while the non-superconducting sample is characterized by a relatively large electronic specific heat.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Yo Tokunaga et al.
Summary: Te-125 NMR experiments in UTe2 reveal slow electronic dynamics in the paramagnetic state, which are associated with the growth of long-range electronic correlations at low temperatures. The experiments also show that disorder or defects disturb the long-range electronic correlations, leading to an inhomogeneous electronic state.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Review
Physics, Condensed Matter
D. Aoki et al.
Summary: This article reviews the recent experimental and theoretical progress on the novel spin-triplet superconductor UTe2 and discusses its rich phase diagrams, unconventional behaviors, and the interplay between its normal and superconducting properties in different conditions.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Nicholas P. Butch et al.
Summary: The temperature dependence of low-energy magnetic excitations in the spin-triplet superconductor UTe2 was measured via inelastic neutron scattering in both normal and superconducting states. These excitations follow a specific behavior that can be explained by interband correlations in a hybridized Kondo lattice, and show notable changes in the superconducting state.
NPJ QUANTUM MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Shouzheng Liu et al.
Summary: The recent discovery of spin-triplet superconductivity in UTe2 has raised interest in understanding the mechanism of Cooper pairing. By using resonant inelastic x-ray scattering and x-ray absorption spectroscopy, researchers found that the experimental data support the models based on 5f(2)6d(1)-like valence electron configuration, providing insights for interpreting the electronic structure and superconducting pairing mechanism.
Article
Materials Science, Multidisciplinary
Yun Suk Eo et al.
Summary: In this study, we investigate the temperature dependence of electrical resistivity in the spin-triplet superconductor UTe2 along different crystallographic axes. Surprisingly, we find that the resistivities in all current directions exhibit a nearly isotropic transport behavior above the Kondo coherence temperature, despite the highly anisotropic band structure. However, distinct behaviors are observed upon cooling. The temperature dependence of the resistivity along the c axis shows a peak at a much lower temperature than that of the resistivity along the a and b axes, indicating a magnetic origin. Comparing these findings with angle-resolved photoemission spectroscopy experiments provides valuable insights into the underlying electronic structure for building a microscopic model of superconductivity in UTe2.
Article
Materials Science, Multidisciplinary
Priscila F. S. Rosa et al.
Summary: In this study, the superconducting properties of UTe2 were investigated and it was found that UTe2 single crystals exhibit a single superconducting transition temperature at 2K, setting new constraints on the multicomponent superconductivity scenario and raising questions about whether UTe2 is a multicomponent superconductor.
COMMUNICATIONS MATERIALS
(2022)
Article
Physics, Multidisciplinary
Shin-ichi Fujimori et al.
Summary: The valence state of UTe2 was investigated using core-level photoelectron spectroscopy, revealing characteristics of mixed-valence uranium compounds with a dominant contribution from the itinerant 5f(3) configuration.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Multidisciplinary Sciences
Leonid Pourovskii et al.
Summary: This passage discusses the nature of order in low-temperature phases of certain materials and the hidden orders that may spark research interest. By studying neptunium dioxide NpO2, it is found that the ground-state order and magnetic excitations can be fully described by a low-energy Hamiltonian, revealing the multipolar exchange mechanism behind the anomalous volume contraction of the NpO2 HO phase.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
I. M. Hayes et al.
Summary: The superconductivity in UTe2 is characterized by a two-component order parameter that breaks time-reversal symmetry, as shown by observations of a nonzero polar Kerr effect and two transitions in specific heat. These findings place constraints on the symmetries of the order parameter and contribute to the discussion on the presence of topological superconductivity in UTe2.
Article
Materials Science, Multidisciplinary
Kristin Willa et al.
Summary: The investigation of the normal state preceding unconventional superconductivity in UTe2 revealed a Schottky-like anomaly with approximately R ln(2) entropy, indicating a common origin with ferromagnetic superconductor URhGe. The comparison of electronic Gruneisen parameters and metamagnetic transition parameters suggested a similarity between the two phenomena, along with the presence of short-range ferromagnetic fluctuations. Enhanced Wilson and Korringa ratios further supported the potential existence of these fluctuations.
Article
Materials Science, Multidisciplinary
W. Knafo et al.
Summary: Inelastic neutron scattering measurements on a single crystal of heavy-fermion paramagnet UTe2 revealed the presence of antiferromagnetic fluctuations with specific characteristics. Weak correlations and saturation temperature of the magnetic fluctuations were highlighted as key findings in this study, providing constraints for models of magnetically mediated superconductivity in UTe2.
Article
Materials Science, Multidisciplinary
Alexander B. Shick et al.
Summary: Correlated band theory based on density functional theory with exact diagonalization was applied to UTe2, revealing its physical properties at different U values, including a transition to a semimetallic state at U = 3 eV. Predictions were made for the Kondo temperature of UTe2 and the electric field gradient difference between uranium and tellurium sites, consistent with experimental observations.
Article
Materials Science, Multidisciplinary
Jun Ishizuka et al.
Summary: The study suggests the presence of multiple superconducting phases and an antiferromagnetic phase in UTe2, proposing pressure-temperature and magnetic field-temperature phase diagrams. Additionally, a mixed-parity superconducting state with spontaneous inversion symmetry breaking is predicted.
Article
Materials Science, Multidisciplinary
Tatsuya Shishidou et al.
Summary: UTe2 is a likely spin-triplet superconductor with evidence for chiral Majorana edge states. It features inversion-symmetry related pairs of U atoms forming rungs of ladders. Each rung's two sublattice degrees of freedom play a key role in understanding the electronic structure and the origin of superconductivity.
Article
Physics, Multidisciplinary
Lin Miao et al.
PHYSICAL REVIEW LETTERS
(2020)
Article
Multidisciplinary Sciences
Lin Jiao et al.
Article
Multidisciplinary Sciences
S. M. Thomas et al.
Article
Materials Science, Multidisciplinary
L. Pourovskii et al.
Article
Physics, Multidisciplinary
Dai Aoki et al.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2019)
Article
Physics, Multidisciplinary
Georg Knebel et al.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2019)
Article
Physics, Multidisciplinary
Atsushi Miyake et al.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2019)
Article
Physics, Multidisciplinary
Shang-Shun Zhang et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Sheng Ran et al.
Article
Physics, Multidisciplinary
Jun Ishizuka et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Materials Science, Multidisciplinary
Alexander B. Shick et al.
Article
Materials Science, Multidisciplinary
Leonid Pourovskii et al.
Article
Materials Science, Multidisciplinary
Pascal Delange et al.
Article
Computer Science, Interdisciplinary Applications
Markus Aichhorn et al.
COMPUTER PHYSICS COMMUNICATIONS
(2016)
Article
Computer Science, Interdisciplinary Applications
Olivier Parcollet et al.
COMPUTER PHYSICS COMMUNICATIONS
(2015)
Article
Physics, Multidisciplinary
J. A. Mydosh et al.
REVIEWS OF MODERN PHYSICS
(2011)
Article
Physics, Multidisciplinary
K. Haule et al.
Review
Multidisciplinary Sciences
Qimiao Si et al.
Article
Physics, Multidisciplinary
Kristjan Haule et al.
Article
Materials Science, Multidisciplinary
Markus Aichhorn et al.
Article
Materials Science, Multidisciplinary
L. V. Pourovskii et al.
