Nuclear spin relaxation at ultralow temperatures
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Physical Review B, Volume 59, Issue 14
AbstractNuclear 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.
nuclear magnetism, nuclear spin relaxation
Ishii, Hiroumi & Hakonen, Pertti J. 1999. Nuclear spin relaxation at ultralow temperatures. Physical Review B. Volume 59, Issue 14. 9462-9466. ISSN 1098-0121 (printed). DOI: 10.1103/physrevb.59.9462