期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 90, 期 11, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.90.113706
关键词
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资金
- ANR FRESCO [ANR-20-CE30-0020]
- JSPS KAKENHI [JP19H00646, 19K03756, JP20H00130, 20H01864, JP20K20889, JP20KK0061, 21H04987]
- Grants-in-Aid for Scientific Research [20H01864, 21H04987, 19K03756] Funding Source: KAKEN
In the superconducting phase of UTe2, unique spin dynamics were observed, including a reduction in relaxation rate and the development of an inelastic peak. The low dimensional nature and a-axis polarization of fluctuations were maintained below the superconducting transition. The high ratio Omega/k(B)T(sc) of approximately 7.2 contrasts with common behavior in heavy fermion superconductors.
We investigate the spin dynamics in the superconducting phase of UTe2 by triple-axis inelastic neutron scattering on a single crystal. At the wave-vector k(1) = (0, 0.57, 0), where the normal state antiferromagnetic correlations are peaked, a modification of the excitation spectrum is evidenced, on crossing the superconducting transition, with a reduction of the relaxation rate together with the development of an inelastic peak at Omega approximate to 1 meV. The low dimensional nature and the a-axis polarization of the fluctuations, that characterise the normal state, are essentially maintained below the superconducting transition. The high ratio Omega/k(B)T(sc) approximate to 7.2 contrasts with the most common behaviour in heavy fermion superconductors.
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