Fermi-Surface Instability in the Heavy-Fermion Superconductor 
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Niu, Qun; Knebel, G.; Braithwaite, D.; Aoki, Dai; Lapertot, G.; Seyfarth, Gabriel; Brison, Jean-Pascal; Flouquet, J.; Pourret, Alexandre

doi:10.1103/physrevlett.124.086601

Cited by 45 publications

(70 citation statements)

References 31 publications

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“…The electron sheet has a large carrier density n ∼ 0.2 per spin which is compensated by the hole sheet. Thus, we see large FSs occupying 40% of the BZ, in accordance with transport measurements [23]. On the other hand, low carrier density shown in Fig.…”

supporting

confidence: 91%

“…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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supporting

confidence: 91%

mentioning

confidence: 94%

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

et al. 2019

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“…Furthermore, reentrant superconductivity arises above H m when the magnetic field is tilted 30 • away from the b axis towards the c axis [10]. The metamagnetic transition occurring at H m with a jump in the magnetization of 0.6 μ B , when the system enters the polarized paramagnetic state (PPM) [10,12,13], is in agreement with a characteristic energy scale given by the temperature of the maximum in the susceptibility of T χ max ≈ 35 K [14] and the maximum of the Hall effect (R H ) [4]. Furthermore, fluctuations are strongly enhanced through H m despite the first-order nature of the metamagnetic transition below the critical end point (CEP) at T CEP ≈ 7 K [12,14].…”

Section: Introductionsupporting

confidence: 66%

“…To extract more information about the field dependence of the carriers across H m , we measured the Hall effect up to 36 T on sample S2 in the static field and up to 68 T on sample S3 in the pulsed field. to positive and shows a maximum at T m ≈ 30 K close to T χ max [4]. This drastic increase of the Hall coefficient at low temperature, which has been observed in many heavy fermion systems, like UPt 3 [25] and UAl 2 [26], is related to the change of the scattering process from incoherent skew scattering at high temperature to a coherent scattering regime at low temperature [27].…”

Section: B Hall Effectmentioning

confidence: 64%

“…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%

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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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