Nuclear antiferromagnetism in rhodium metal at positive and negative nanokelvin temperatures

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
1993
Major/Subject
Mcode
Degree programme
Language
en
Pages
2818-2821
Series
Physical Review Letters, Volume 70, Issue 18
Abstract
We have measured the dynamic susceptibility of polycrystalline rhodium foils down to 280 pK and up to -750 pK. These record-low and -high nuclear spin temperatures were reached by adiabatic demagnetization using initial polarizations of 83 and -60%. At T>0, the static susceptibility, integrated from NMR spectra, displays an antiferromagnetic Curie-Weiss law, with θ=-1.8±0.3 nK. At T<0, a crossover from ferro- to antiferromagnetic tendency is found around -6 nK. We obtain Jnn/h=-17±3 Hz and Jnnn/h=10±3 Hz if only nearest and next nearest neighbor interactions are assumed.
Description
Keywords
nuclear ordering, antiferromagnetism, negative temperatures
Other note
Citation
Hakonen, Pertti J. & Vuorinen, R. T. & Martikainen, J. E. 1993. Nuclear antiferromagnetism in rhodium metal at positive and negative nanokelvin temperatures. Physical Review Letters. Volume 70, Issue 18. 2818-2821. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.70.2818