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Spin-Triplet Superconductivity in UNi2Al3 Revealed by the 27Al Knightshift Measurement

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Ishida, K., Ozaki, D., Kamatsuka, T., Tou, H., Kyogaku, M., Kitaoka, Y., et al. (2002). Spin-Triplet Superconductivity in UNi2Al3 Revealed by the 27Al Knightshift Measurement. Physical Review Letters, 89(3): 037002, pp. 037002-037002. doi:10.1103/PhysRevLett.89.037002.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-3127-0
Abstract
We report Al-27 Knight shift (K-27) measurement on a single- crystal UNi2Al3 that reveals a coexistence of superconductivity and a spin-density-wave (SDW) type of magnetic ordering (T- SDW=4.5 K ). The spin part of K-27, K-27(s), does not change down to 50 mK across the superconducting (SC) transition temperature T(c)similar to0.9 K . In contrast with the isostructural compound UPd2Al (3) (T(c)similar to2 K ), which was identified to be a spin-singlet d -wave superconductor, the behavior of K-27 strongly supports that UNi2Al3, like UPt3 and Sr2RuO4 , belongs to a class of spin-triplet SC pairing state superconductors.