d-Wave Superconductivity in Antiferromagnetic Heavy-Fermion Compound UPd2Al3 
–Evidence from27Al NMR/NQR Studies–

Tou, Hideki; Kitaoka, Yoshio; Asayama, Kunisuke; Geibel, Christoph; Schank, Christina; Steglich, Frank

doi:10.1143/JPSJ.64.725

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d-Wave Superconductivity in Antiferromagnetic Heavy-Fermion Compound UPd₂Al₃ –Evidence from ²⁷Al NMR/NQR Studies–

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Citation

Tou, H., Kitaoka, Y., Asayama, K., Geibel, C., Schank, C., & Steglich, F. (1995). d-Wave Superconductivity in Antiferromagnetic Heavy-Fermion Compound UPd₂Al₃ –Evidence from ²⁷Al NMR/NQR Studies–. Journal of the Physical Society of Japan, 64(3), 725-729. doi:10.1143/JPSJ.64.725.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-E61F-5

Abstract

The nuclear-spin-lattice relaxation rate, 27(1/T-1), Of the high-quality polycrystalline UPd(2)A1(3) with a record T-c = 2 K and the narrowest Al NQR linewidth to date of 12 kHz has been measured in zero magnetic field by the NQR technique. 27(1/T-1) below T-c has been found to obey the T-3-law at least down to 0.18 K, giving strong evidence that the energy gap vanishes along lines on the Fermi surface. From the analysis of Al-27 Knight shift below T-c, it is shown that the anisotropic residual Knight shift originates from the f-electron susceptibility in the antiferromagnetic state, whereas the isotropic reduction of the shift below T-c is due to a singlet pairing nature of the superconductivity. Both the results of 27(1/T-1) and Al-27 Knight shift in UPd2Al3 can be reproduced consistently by a d-wave pairing model characterized by lines of vanishing gap on the Fermi surface.