Superconductivity and Magnetism of the New Heavy Fermion Superconductors UM2Al3 
(M=Ni, Pd)–27Al NMR Study–

Kyogaku, Masafumi; Kitaoka, Yoshio; Asayama, Kunisuke; Geibel, Christoph; Schank, Christina; Steglich, Frank

doi:10.1143/JPSJ.61.2660

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Superconductivity and Magnetism of the New Heavy Fermion Superconductors UM₂Al₃ (M=Ni, Pd)–²⁷Al NMR Study–

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Citation

Kyogaku, M., Kitaoka, Y., Asayama, K., Geibel, C., Schank, C., & Steglich, F. (1992). Superconductivity and Magnetism of the New Heavy Fermion Superconductors UM₂Al₃ (M=Ni, Pd)–²⁷Al NMR Study–. Journal of the Physical Society of Japan, 61(8), 2660-2664. doi:10.1143/JPSJ.61.2660.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-D77B-E

Abstract

The magnetic and superconducting properties of the new heavy fermion superconductors (HFS), UNi2Al3 and UPd2Al3 have been investigated by Al-27 NMR. The magnetic ordering is unambiguously identified by a significant increase of Al-27 linewidth below T(N) = 4.6 K and an enhancement of the nuclear-spin-lattice relaxation rate 27(1 / Tl) around T(N) in UNi2Al3 and by a gradual increase of the linewidth and a distinct drop of 27(1 / Tl) below T(N) = 14 K in UPd2Al3. Below T(c) = 0.9 K in a magnetic field of 2.8 kOe, no anomalies of 1 / Tl and Knight shift have been observed in UNi2Al3, whereas the superconductivity in UPd2Al3 is well evidenced by a significant decrease of both 1 / Tl and Knight shift below T(c) = 1.8 K in 4.9 kOe. The behavior of 1 / Tl in UPd2Al3, with no coherence peak just below T(c), is well described down to 0.65 K by a model of gap zeros on lines at the Fermi surface, being quite similar to the behavior in HFS reported thus far.