Nuclear spin relaxation at ultralow temperatures

Hiroumi Ishii*, Pertti J. Hakonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
125 Downloads (Pure)


Nuclear spin relaxation induced by hyperfine coupling is studied theoretically at positive and negative submicrokelvin temperatures. By avoiding the assumption of the high-temperature limit, adopted in conventional theories, we derive a formula in which the relaxation rate is expressed in terms of thermal averages of nuclear spin energies. The exchange interaction induces an asymmetry in the energy spectrum, which leads to relaxation rates that depend on whether the nuclear spin temperature is positive or negative. High-temperature expansion methods and Monte Carlo simulations are applied to explain the anomalous results by Hakonen et al. in rhodium qualitatively.

Original languageEnglish
Pages (from-to)9462-9466
Number of pages5
JournalPhysical Review B
Issue number14
Publication statusPublished - 1 Apr 1999
MoE publication typeA1 Journal article-refereed

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