Drastic change in magnetic anisotropy of 
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 under pressure revealed by 
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-NMR

Kinjo, Katsuki; Fujibayashi, Hiroki; Nakamine, Genki; Kitagawa, Shunsaku; Ishida, K.; Tokunaga, Y.; Sakai, Hironori; Kambe, S.; Nakamura, Ai; Shimizu, Yusei; Homma, Yoshiya; Li, Dexin; Honda, Fuminori; Aoki, Dai

doi:10.1103/physrevb.105.l140502

Cited by 10 publications

(5 citation statements)

References 31 publications

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“…Here, the NMR Knight shift is proportional to the spin susceptibility, and the FWHM is proportional to the distribution of magnetization. As reported in the previous papers (24)(25)(26), K b exhibits a broad maximum at Tχ max and gradually decreases with decreasing T, similar to the T dependence of χ (24). Owing to the increase in T c and the decrease in Tχ max with increasing P (24), K b highly depends on T around T c at 1.2 GPa, unlike the case of ambient pressure (0 GPa).…”

Section: Resultssupporting

confidence: 76%

“…At the P ∼ 1.2 GPa where T c becomes maximum, H m is suppressed to almost half of H m at P = 0, and there is no more L-shaped behavior in H b -T phase diagram (26). Considering the similarity in spin susceptibility in the SC state between the HFSC and SC2 states and first-order transition such as disappearance of SC state and Kondo coherent state with applying field or pressure (25,33,34), we conclude that the HFSC evolves into SC2 with applying pressure. In addition, the SC1 phase hides under the SC2 phase and becomes the SC3 phase (coexisting phase of SC1 and SC2), while the SC3 phase appears only inside the SC2 phase.…”

Section: Resultsmentioning

confidence: 98%

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Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

et al. 2023

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Superconducting (SC) state has spin and orbital degrees of freedom, and spin-triplet superconductivity shows multiple SC phases because of the presence of these degrees of freedom. However, the observation of spin-direction rotation occurring inside the SC state (SC spin rotation) has hardly been reported. Uranium ditelluride, a recently found topological superconductor, exhibits various SC phases under pressure: SC state at ambient pressure (SC1), high-temperature SC state above 0.5 gigapascal (SC2), and low-temperature SC state above 0.5 gigapascal (SC3). We performed nuclear magnetic resonance (NMR) and ac susceptibility measurements on a single-crystal uranium ditelluride. The b axis spin susceptibility remains unchanged in SC2, unlike in SC1, and decreases below the SC2-SC3 transition with spin modulation. These unique properties in SC3 arise from the coexistence of two SC order parameters. Our NMR results confirm spin-triplet superconductivity with SC spin parallel to b axis in SC2 and unveil the remaining of spin degrees of freedom in SC uranium ditelluride.

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 98%

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

et al. 2023

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“…NMR measurements of UTe 2 indicate that there is a discontinuous change in its electronic structure at P c , likely due to destruction of the Kondo coherent state [98]. Above P c the heat capacity of UTe 2 exhibits two local maxima as a function of temperature, indicating phase transitions [97], which correspond to anomalies in normal-state resistivity [17,18,20,95,97].…”

Section: Behavior At or Above Pcmentioning

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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Section: Mechanical Modulationmentioning

confidence: 99%

“…[243] This is in contrast with former investigations, where the superconductivity is accompanied by Kondo coherence. [241,342] An exotic magnetic order exists within the temperature ranging from the superconducting onset to zero-resistance temperature, extracted from the electronic transport measurement. [243] More experiments are needed to verify the influence of composition, whether the superconductivity is intrinsic to UTe 2 or has partial contributions from extra ingredients.…”

Section: Ute 2 : a Novel Heavy-fermion Superconductormentioning

confidence: 99%

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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Drastic change in magnetic anisotropy of UTe2 under pressure revealed by Te125 -NMR

Cited by 10 publications

References 31 publications

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

A review of UTe₂at high magnetic fields

Modulations in Superconductors: Probes of Underlying Physics

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Drastic change in magnetic anisotropy of UTe2 under pressure revealed by Te125 -NMR

Cited by 10 publications

References 31 publications

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe 2

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe 2

A review of UTe2at high magnetic fields

Modulations in Superconductors: Probes of Underlying Physics

Contact Info

Product

Resources

About

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

A review of UTe₂at high magnetic fields