Nuclear magnetism in silver at positive and negative absolute temperatures in the low nanokelvin range
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© 1990 American Physical Society (APS). This is the accepted version of the following article: Hakonen, Pertti J. & Yin, S. & Lounasmaa, O. V. 1990. Nuclear magnetism in silver at positive and negative absolute temperatures in the low nanokelvin range. Physical Review Letters. Volume 64, Issue 22. 2707-2710. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.64.2707, which has been published in final form at http://journals.aps.org/prl/pdf/10.1103/PhysRevLett.64.2707.
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en
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2707-2710
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Physical Review Letters, Volume 64, Issue 22
Abstract
We have investigated the susceptibility and entropy in the thermally isolated system of silver nuclei down to 0.8 nK and, at negative temperatures, up to -4.3 nK. Low-frequency SQUID-NMR techniques were employed to measure the dynamic sysceptibility. Curie-Weiss behavior was observed for the static susceptibility both at T>0 and T<0; for FTHETA we deduce -4.4±1.0 nK. Our results show directly that antiferromagnetic nuclear alignment at positive temperatures transforms into ferromagnetic orientation at T<0 in the nuclear-spin system of silver, dominated by exchange interaction.Description
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Hakonen, Pertti J. & Yin, S. & Lounasmaa, O. V. 1990. Nuclear magnetism in silver at positive and negative absolute temperatures in the low nanokelvin range. Physical Review Letters. Volume 64, Issue 22. 2707-2710. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.64.2707