Title

Barium Nuclear Magnetic Resonance Spectroscopic Study of YBa2Cu3O7

Document Type

Article

Publication Date

7-1992

Abstract

We have measured the 135Ba nuclear magnetic resonance (NMR) line shape and the 137Ba nuclear quadrupole resonance (NQR) of a powder sample of YBa2Cu3O7, at 300 K, as well as the temperature and field dependences of the 135,137Ba NMR line shapes and spin-lattice relaxation rates of magnetically aligned (c?H0) samples, in the normal and superconducting states. From the NQR and the field and isotopic dependences of the NMR line shapes of magnetically aligned samples at 300 K, we conclude that the magnetic shift is small (0.0±0.12%), and that the principal components of the electric-field gradient tensor are ±(8.3,-0.2,-8.1)×1021 V m−2, with the largest component coincident with the crystallographic c axis. In the superconducting state, the resonances broaden and are shifted to lower frequency. The spin-lattice relaxation behavior is not Korringa-like above Tc, and may be influenced by spin fluctuations in the CuO2 plane.

Publication Title

Physical Review B

Volume

46

First Page

595

Last Page

598

DOI of Published Version

10.1103/PhysRevB.46.595

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