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arXiv · 0711.1392

Nuclear-spin relaxation of $^{207}$Pb in ferroelectric powders

L. -S. Bouchard·A. O. Sushkov·D. Budker·J. J. Ford·A. S. Lipton
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Abstract

Motivated by a recent proposal by O. P. Sushkov and co-workers to search for a P,T-violating Schiff moment of the $^{207}$Pb nucleus in a ferroelectric solid, we have carried out a high-field nuclear magnetic resonance study of the longitudinal and transverse spin relaxation of the lead nuclei from room temperature down to 10 K for powder samples of lead titanate (PT), lead zirconium titanate (PZT), and a PT monocrystal. For all powder samples and independently of temperature, transverse relaxation times were found to be $T_2\approx 1.5 $ms, while the longitudinal relaxation times exhibited a temperature dependence, with $T_1$ of over an hour at the lowest temperatures, decreasing to $T_1\approx 7 $s at room temperature. At high temperatures, the observed behavior is consistent with a two-phonon Raman process, while in the low temperature limit, the relaxation appears to be dominated by a single-phonon (direct) process involving magnetic impurities. This is the first study of temperature-dependent nuclear-spin relaxation in PT and PZT ferroelectrics at such low temperatures. We discuss the implications of the results for the Schiff-moment search.

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L. -S. Bouchard, A. O. Sushkov, D. Budker, J. J. Ford, A. S. Lipton. 2007-11-09. Nuclear-spin relaxation of $^{207}$Pb in ferroelectric powders. https://doi.org/10.1103/physreva.77.022102

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