J. Phys. Soc. Jpn. 58, pp. 1528-1531 (1989) [4 Pages]
LETTERS

Copper NQR and NMR investingations of Metallic but Nonsuperconducting La4BaCu5O13+x

+ Affiliations
1Institute for Solid State Physics, The University of Tokyo2Department of Chemistry, Faculty of Science, Kyoto University

Copper nuclear quadrupole/magnetic resonance (NQR/NMR) has been observed for the pyramidal copper sites in a metallic but nonsuperconducting copper oxide with mixed valence, La 4 BaCu 5 O 13+ x . The electric quadrupole interaction, as well as the NMR shifts, was found to be quite similar to that observed for YBa 2 Cu 3 O 7 , while the nuclear spin-lattice relaxation rate was found to be much lower (1/ T 1 =190 sec -1 at 100 K) compared with that in the normal state of YBa 2 Cu 3 O 7 (1/ T 1 =2300 sec -1 at 100 K). These observations indicate that the behaviors of antiferromagnetic copper spin fluctuations of nonsuperconducting and superconducting oxides are very different.

©1989 The Physical Society of Japan

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