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Journal Articles

Chiral superconductivity in UTe$$_2$$ probed by anisotropic low-energy excitations

Ishihara, Kota*; Roppongi, Masaki*; Kobayashi, Masayuki*; Imamura, Kumpei*; Mizukami, Yuta*; Sakai, Hironori; Opletal, P.; Tokiwa, Yoshifumi; Haga, Yoshinori; Hashimoto, Kenichiro*; et al.

Nature Communications (Internet), 14, p.2966_1 - 2966_7, 2023/05

https://doi.org/10.1038/s41467-023-38688-y
 Times Cited Count：1 Percentile：89.39(Multidisciplinary Sciences)

The superconducting symmetry of the heavy fermion uranium-based superconductor UTe$$_2$$ is investigated using low temperature penetration depth measurements. The anisotropic low-energy quasiparticle excitations indicates multiple superconducting components in a chiral complex form. The most consistent is a chiral non-unitary state.

Journal Articles

Anisotropic enhancement of lower critical field in ultraclean crystals of spin-triplet superconductor candidate UTe$$_2$$

Ishihara, Kota*; Kobayashi, Masayuki*; Imamura, Kumpei*; Konczykowski, M.*; Sakai, Hironori; Opletal, P.; Tokiwa, Yoshifumi; Haga, Yoshinori; Hashimoto, Kenichiro*; Shibauchi, Takasada*

Physical Review Research (Internet), 5(2), p.L022002_1 - L022002_6, 2023/04

https://doi.org/10.1103/PhysRevResearch.5.L022002

Lower superconducting critical fields $$H_{rm c1}$$ of UTe$$_2$$ have been determined. Orthorhombic UTe$$_2$$ has magnetic easy axis along the $$a$$-axis. We found $$H_{rm c1}$$ perpendicular to $$a$$ showed anomalous enhancement. By comparing with anisotropy of upper critical fields, effect of magnetic fluctuations on superconductivity is suggested.

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