Spin dynamics in highly polarized silver at negative absolute temperatures

P. J. Hakonen*, K. K. Nummila, R. T. Vuorinen

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Citations (Scopus)
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Abstract

We have studied the spin dynamics of highly polarized silver nuclei at negative absolute temperatures up to inverted polarizations p-70%. The measured NMR spectra at B=0.4 and 0.8 mT display a clear inverted suppression-enhancement effect, arising from an interaction between the two spin species, Ag107 and Ag109. The averaged interaction-field description accounts well for the intensity ratio of the isotopic NMR lines. The frequency difference of the absorption maxima has been used to study the merging and repulsion of the NMR modes at large negative polarizations. At B=0.2 mT, our spectra display only a single exchange-merged line, indicating that the two isotopes act as like spins. The transition from a single NMR line to two separate lines proceeds in a similar fashion as at positive temperatures. No effects attributable to the tendency of ferromagnetic alignment of spins at T

Original languageEnglish
Pages (from-to)2196-2200
Number of pages5
JournalPhysical Review B
Volume45
Issue number5
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

Keywords

  • negative absolute temperatures
  • polarized silver
  • spin dynamics

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