Possible coexistence of antiferromagnetic and ferromagnetic spin fluctuations in the spin-triplet superconductor 
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 revealed by 
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 NMR under pressure

Ambika, Devi V.; Ding, Qing-Ping; Rana, Khusboo; Frank, Corey E.; Green, D.; Ran, Sheng; Butch, Nicholas P.; Furukawa, Yuji

doi:10.1103/physrevb.105.l220403

Cited by 15 publications

(2 citation statements)

References 27 publications

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“…Such a paring state in Sr 2 RuO 4 was theoretically proposed 11 . Furthermore, recently discovered candidate for spin-triplet superconductor UTe 2 12,13 is predicted to realize the s+ip-wave pairing state 14 , as it is consistent with the experimentally observed multiple superconducting phases [15][16][17][18][19][20][21] and multiple magnetic fluctuations [22][23][24][25][26][27] .…”

Section: Introductionsupporting

confidence: 73%

Quantum-geometry-induced anapole superconductivity

Kitamura¹,

Kanasugi²,

Chazono³

et al. 2022

Preprint

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Anapole superconductivity recently proposed for multiband superconductors [Commun. Phys. 5, 39 (2022)] is a key feature of time-reversal (T )-symmetry-broken polar superconductors. The anapole moment was shown to arise from the asymmetric Bogoliubov spectrum, which induces a finite center of mass momenta of Cooper pairs at the zero magnetic field. In this paper, we show an alternative mechanism of anapole superconductivity: the quantum geometry induces the anapole moment when the interband pairing and Berry connection are finite. Thus, the anapole superconductivity is a ubiquitous feature of T -broken multiband polar superconductors. Applying the theory to a minimal model of UTe2, we demonstrate the quantum-geometry-induced anapole superconductivity. Furthermore, we show the Bogoliubov Fermi surfaces (BFS) in an anapole superconducting state and predict an unusual temperature dependence of BFS due to the quantum geometry. Experimental verification of these phenomena may clarify the superconducting state in UTe2 and reveal the ubiquitous importance of quantum geometry in exotic superconductors.

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Section: Introductionsupporting

confidence: 73%

Quantum-geometry-induced anapole superconductivity

Kitamura¹,

Kanasugi²,

Chazono³

et al. 2022

Preprint

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“…The magnetic interactions relevant to superconducting pairing likely have lower energy scales than the observed correlations. NMR measurements have been interpreted in the context of a mixture of ferromagnetic and antiferromagnetic interactions [57].…”

Section: Zero-field Superconductivitymentioning

confidence: 99%

A review of UTe₂at high magnetic fields

Lewin,

Frank,

Ran

et al. 2023

Rep. Prog. Phys.

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Uranium ditelluride (UTe2) is recognized as a host material to unconventional spin-triplet superconductivity, but it also exhibits a wealth of additional unusual behavior at high magnetic fields. One of the most prominent signatures of the unconventional superconductivity is a large and anisotropic upper critical field that exceeds the paramagnetic limit. This superconductivity survives to 35 T and is bounded by a discontinuous magnetic transition, which itself is also fielddirection-dependent. A different, reentrant superconducting phase emerges only on the high-field side of the magnetic transition, in a range of angles between the crystallographic b and c axes. This review discusses the current state of knowledge of these high-field phases, the high-field behavior of the heavy fermion normal state, and other phases that are stabilized by applied pressure.

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Modulations in Superconductors: Probes of Underlying Physics

et al. 2023

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development of various modulations techniques, breakthroughs in quantum materials are achieved, such as the quantum anomalous Hall effect (AHE) in topological insulators, [1][2][3][4] gate-tuned roomtemperature ferromagnetism in 2D van der Waals materials, [5][6][7][8] and emergent magnetic monopoles in artificial spin ice. [9] Especially, as the quantum materials of particular interest with zero dissipation, superconductors have been intensively studied with advanced modulations, aiming to reveal a plethora of emergent phenomena in condensed matter physics, such as superconductor-to-insulator transitions (SIT), [10][11][12] intermediate bosonic metallic state, [13] Bose-Einstein condensation (BEC)-Bardeen-Cooper-Schrieffer (BCS) crossover, [14,15] and intertwined orders, [16][17][18] as well as to develop applications in quantum computing [19][20][21] and ultrasensitive detections. [22][23][24] The superconductivity composes of two ingredients, including the Cooper pairs, each formed by two electrons, and phase coherence among Cooper pairs. [25] Superconductors such as metals and alloys are in the weak-coupling regime, which is well understood by BCS theory. [26,27] However, the later discovered superconductors, including cuprates, iron-based superconductors, and heavy-fermion superconductors, are strongly correlated systems, where a widely accepted microscopic mechanism yet remains absent. Therefore, various modulations have been utilized for the ultimate understanding of these superconductors and routines for room temperature superconductivity. Traditional modulations, such as elemental substitution, annealing, and polarization-induced gating are usually accompanied by some severe problems, including discontinuity, disorders, and limited ranges. Recently, state-of-the-art techniques have been developed with improved convenience, increased capability, and unprecedented dimensionalities, enabling more thorough investigations of unconventional superconductors.As a manifestation, we take some examples discussed in this review in advance. The carrier density can be tuned more conveniently and continuously. The techniques of ionic field-effect transistor (iFET) and electric double-layer transistor (EDLT) surpass conventional methods limited by solid solubility or dielectric breakdown, which enables the more precise phase diagram and detailed scaling analysis at the quantum phaseThe importance of modulations is elevated to an unprecedented level, due to the delicate conditions required to bring out exotic phenomena in quantum materials, such as topological materials, magnetic materials, and superconductors. Recently, state-of-the-art modulation techniques in material science, such as electric-double-layer transistor, piezoelectric-based strain apparatus, angle twisting, and nanofabrication, have been utilized in superconductors. They not only efficiently increase the tuning capability to the broader ranges but also extend the tuning dimensionality to unprecedented degrees of freedom, including quantum fluctuations of...

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Possible coexistence of antiferromagnetic and ferromagnetic spin fluctuations in the spin-triplet superconductor UTe2 revealed by Te125 NMR under pressure

Cited by 15 publications

References 27 publications

Quantum-geometry-induced anapole superconductivity

Quantum-geometry-induced anapole superconductivity

A review of UTe₂at high magnetic fields

Modulations in Superconductors: Probes of Underlying Physics

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Possible coexistence of antiferromagnetic and ferromagnetic spin fluctuations in the spin-triplet superconductor UTe2 revealed by Te125 NMR under pressure

Cited by 15 publications

References 27 publications

Quantum-geometry-induced anapole superconductivity

Quantum-geometry-induced anapole superconductivity

A review of UTe2at high magnetic fields

Modulations in Superconductors: Probes of Underlying Physics

Contact Info

Product

Resources

About

A review of UTe₂at high magnetic fields