Quasi-Two-Dimensional Fermi Surfaces and Unitary Spin-Triplet Pairing in the Heavy Fermion Superconductor 
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Xu, Yuanji; Sheng, Yuqi; Yang, Yi-feng

doi:10.1103/physrevlett.123.217002

Cited by 86 publications

(56 citation statements)

References 59 publications

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“…and this helps explain the high observed value of H c2 in UTe 2 , as we show below. The key point is the quasi-two-dimensional nature of the Fermi surface sheets parallel to the c-axis, established by ARPES 21 and ab initio calculations 17,22 , which can be approximated by writing the dispersion as…”

Section: Resultsmentioning

confidence: 99%

Tuning magnetic confinement of spin-triplet superconductivity

et al. 2020

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Electrical magnetoresistance and tunnel diode oscillator measurements were performed under external magnetic fields up to 41 T applied along the crystallographic b axis (hard axis) of UTe2 as a function of temperature and applied pressures up to 18.8 kbar. In this work, we track the field-induced first-order transition between superconducting and magnetic field-polarized phases as a function of applied pressure, showing suppression of the transition with increasing pressure until the demise of superconductivity near 16 kbar and the appearance of a pressure-induced ferromagnetic-like ground state that is distinct from the field-polarized phase and stable at zero field. Together with evidence for the evolution of a second superconducting phase and its upper critical field with pressure, we examine the confinement of superconductivity by two orthogonal magnetic phases and the implications for understanding the boundaries of triplet superconductivity.

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Section: Resultsmentioning

confidence: 99%

Tuning magnetic confinement of spin-triplet superconductivity

et al. 2020

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“…This may explain why UTe 2 does not undergo magnetic order in contrast to UCoGe and URhGe. A recent first-principles study proposes a similar scenario [41].…”

Section: Fssmentioning

confidence: 99%

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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“…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.…”

Section: Introductionmentioning

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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Quasi-Two-Dimensional Fermi Surfaces and Unitary Spin-Triplet Pairing in the Heavy Fermion Superconductor UTe2

Cited by 86 publications

References 59 publications

Tuning magnetic confinement of spin-triplet superconductivity

Tuning magnetic confinement of spin-triplet superconductivity

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

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