Inhomogeneous Superconducting State Probed by <sup>125</sup>Te NMR on UTe<sub>2</sub>

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

doi:10.7566/jpsj.90.064709

Cited by 30 publications

(34 citation statements)

References 30 publications

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“…Strongest evidence for spin-triplet superconductivity in UTe 2 was given by the Knight shift of NMR experiments, which shows only a tiny decrease of the spin susceptibility below T c . [15][16][17] Another important point in UTe 2 is the appearance of multiple superconducting phases under pressure. 18) The superconducting transition at T c splits into two above 0.25 GPa.…”

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confidence: 99%

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂

Nakamura

Honda

et al. 2021

J. Phys. Soc. Jpn.

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We report the magnetic susceptibility and the magnetization under pressures up to 1.7 GPa above the critical pressure, P c ∼ 1.5 GPa, for H ∥ a, b, and c-axes in the novel spin triplet superconductor UTe 2 . The anisotropic magnetic susceptibility at low pressure with the easy magnetization a-axis changes to the quasi-isotropic behavior at high pressure, revealing a rapid suppression of the susceptibility for a-axis, and a gradual increase of the susceptibility for the b-axis. At 1.7 GPa above P c , magnetic anomalies are detected at T MO ∼ 3 K and T WMO ∼ 10 K. The former anomaly corresponds to long-range magnetic order, most likely antiferromagnetism, while the latter shows a broad anomaly, which is probably due to the development of short range order. The unusual decrease and increase of the susceptibility below T WMO for H ∥ a and b-axes, respectively, indicate the complex magnetic properties at low temperatures above P c . This is related to the interplay between multiple fluctuations dominated by antiferromagnetism, ferromagnetism, valence and Fermi surface instabilities.

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confidence: 99%

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂

Nakamura

Honda

et al. 2021

J. Phys. Soc. Jpn.

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“…In this work, we discussed the effect of inhomogeneity near a field-driven first-order transition. Inhomogeneity in UTe 2 has been observed in NMR 14 and specific heat experiments 13 . Typically, the recent specific heat measurement observes different signals from different parts of a sample, which directly illustrates the importance of inhomogeneity.…”

Section: Discussionmentioning

confidence: 89%

Quenched randomness, thermal fluctuations and reentrant superconductivity: application to UTe$_2$

Yu,

Raghu

2021

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Reentrant superconductivity has been observed in the candidate spin-triplet superconductor UTe2 as a function of the magnetic field applied along the hard axis. Resistivity measurements have shown, a broadened superconducting transition appears near the minimal Tc, highlighting the importance of superconducting fluctuations in this regime. We present a phenomenological study assuming a field-driven first-order transition between two superconducting states. We show that with quenched randomness, inhomogeneity-enhanced superconducting fluctuations near the transition could naturally account for both the reentrant superconductivity as well as the broadened superconducting transition.

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“…The possible coexistence of spin-triplet and spin-singlet Cooper pairs may lead to the spontaneous IS and TRS symmetry breaking [36], even though the crystal structure is centrosymmetric. It is urgent to determine the symmetry of multiple superconducting phases in UTe 2 [43][44][45][46][47], and the SCPE may be helpful for solving the current issues.…”

Section: Summary and Discussionmentioning

confidence: 99%

Superconducting piezoelectric effect

Chazono,

Watanabe,

Yanase

2021

Preprint

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The magnetopiezoelectric effect (MPE) is a cross-coupling between an electric current and strain in metals with neither inversion symmetry nor time-reversal symmetry. Unlike the conventional piezoelectric effect, the MPE allows a piezoelectric response in superconductors, as we call the superconducting piezoelectric effect (SCPE). The SCPE may enable a piezoelectric response without Joule heating and provide a probe of exotic superconducting symmetry. In this paper, we propose a formulation of the SCPE and calculate both the MPE and SCPE in the two-dimensional noncentrosymmetric s-wave superconductor under an in-plane magnetic field. We find that the magnitude of the SCPE is comparable to the MPE. It is also clarified that finite total momentum of Cooper pairs in the helical superconducting state plays a crucial role in the SCPE.

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Inhomogeneous Superconducting State Probed by ¹²⁵Te NMR on UTe₂

Cited by 30 publications

References 30 publications

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂

Quenched randomness, thermal fluctuations and reentrant superconductivity: application to UTe$_2$

Superconducting piezoelectric effect

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Inhomogeneous Superconducting State Probed by 125Te NMR on UTe2

Cited by 30 publications

References 30 publications

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2

Quenched randomness, thermal fluctuations and reentrant superconductivity: application to UTe$_2$

Superconducting piezoelectric effect

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Product

Resources

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Inhomogeneous Superconducting State Probed by ¹²⁵Te NMR on UTe₂

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂