Anisotropic response of spin susceptibility in the superconducting state of 
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 probed with 
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 measurement

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:10.1103/physrevb.103.l100503

Cited by 55 publications

(67 citation statements)

References 25 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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“…We now discuss the asymmetric BS and anapole superconductivity in UTe 2 . Intensive studies after the discovery of superconductivity evidenced odd-parity spin-triplet superconductivity in UTe 2 [54][55][56][66][67][68][69][70][71][72][73][74][75][76][77][78][79] . However, multiple superconducting phases similar to Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Since the crystal structure of UTe 2 preserves D 2h point group symmetry, the superconducting order parameter is classified based on the IRs of D 2h . Below we consider all the odd-parity IRs, namely, A u , B 1u , B 2u , and B 3u , although the A u and B 3u IRs may be promising candidates 25,77,78,80,87 . Moreover, a recent calculation has shown that the even-parity A g superconducting state is favored by antiferromagnetic fluctuation under pressure 25 .…”

Section: Resultsmentioning

confidence: 99%

Anapole superconductivity from $${{{{{{{\mathcal{PT}}}}}}}}$$-symmetric mixed-parity interband pairing

Kanasugi

Yanase

2022

Commun Phys

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Recently, superconductivity with spontaneous time-reversal or parity symmetry breaking is attracting much attention owing to its exotic properties, such as nontrivial topology and nonreciprocal transport. Particularly fascinating phenomena are expected when the time-reversal and parity symmetry are simultaneously broken. This work shows that time-reversal symmetry-breaking mixed-parity superconducting states generally exhibit an unusual asymmetric Bogoliubov spectrum due to nonunitary interband pairing. For generic two-band models, we derive the necessary conditions for the asymmetric Bogoliubov spectrum. We also demonstrate that the asymmetric Bogoliubov quasiparticles lead to the effective anapole moment of the superconducting state, which stabilizes a nonuniform Fulde-Ferrell-Larkin-Ovchinnikov state at zero magnetic fields. The concept of anapole order employed in nuclear physics, magnetic materials science, strongly correlated electron systems, and optoelectronics is extended to superconductors by this work. Our conclusions are relevant for any multiband superconductors with competing even- and odd-parity pairing channels. Especially, we discuss the superconductivity in UTe2.

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“…Moreover, to identify the spin state thoroughly, NMR measurements on a single crystalline sample in field applied along each axis are required. A very good sensitivity on high quality single crystals was obtained in the next studies [119,120,121], using in addition 125 Te-enriched samples (99.9% of 125 Te): the signal intensity of the enriched sample was roughly one order of magnitude larger than that of the Te-natural sample.…”

Section: Superconductivity Abovementioning

confidence: 85%

Unconventional Superconductivity in UTe2

Aoki,

Brison,

Flouquet

et al. 2021

Preprint

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The novel spin-triplet superconductor candidate UTe 2 was discovered only recently at the end of 2018 and attracted enormous attention. We review key experimental and theoretical progress which has been achieved in different laboratories. UTe 2 is a heavy-fermion paramagnet, but right after the discovery of superconductivity it has been expected to be close to a ferromagnetic instability showing many similarities to the U-based ferromagnetic superconductors, URhGe and UCoGe. The competition between different types of magnetic interactions and the duality between the local and itinerant character of the 5f Uranium electrons, as well as the shift of the U valence appear as key parameters in the rich phase diagrams discovered recently under extreme conditions like low temperature, high magnetic field, and pressure. We discuss macroscopic and microscopic experiments at low temperature to clarify the normal phase properties at ambient pressure for field applied along the three axis of this orthorhombic structure. Special attention will be given to the occurrence of a metamagnetic transition at Hm = 35 T for a magnetic field applied along the hard magnetic axis b. Adding external pressure leads to strong changes in the magnetic and electronic properties with a direct feedback on superconductivity. Attention will be given on the possible evolution of the Fermi surface as a function of magnetic field and pressure.Superconductivity in UTe 2 is extremely rich exhibiting various unconventional behaviors which will be highlighted.It shows an exceptionally huge superconducting upper critical field with a re-entrant behavior under magnetic field and the occurrence of multiple superconducting phases in the temperature field, pressure phase diagram.There is evidence for spin-triplet pairing. Experimental indications exist for chiral superconductivity and spontaneous time reversal symmetry breaking in the superconducting state. The different theoretical approaches will be described. Notably we discuss that UTe 2 is a possible example for the realization of a fascinating topological superconductor. The recent discovery of superconductivity in UTe 2 reemphasizes that U-based heavy fermion compounds give unique examples to study and understand the strong interplay between the normal and superconducting properties in strongly correlated electron systems.

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Anisotropic response of spin susceptibility in the superconducting state of UTe2 probed with Te125−NMR measurement

Cited by 55 publications

References 25 publications

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂

Anapole superconductivity from $${{{{{{{\mathcal{PT}}}}}}}}$$-symmetric mixed-parity interband pairing

Unconventional Superconductivity in UTe2

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Anisotropic response of spin susceptibility in the superconducting state of UTe2 probed with Te125−NMR measurement

Cited by 55 publications

References 25 publications

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe2

Anapole superconductivity from $${{{{{{{\mathcal{PT}}}}}}}}$$-symmetric mixed-parity interband pairing

Unconventional Superconductivity in UTe2

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Product

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Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂

Magnetic Properties under Pressure in Novel Spin-Triplet Superconductor UTe₂