Nuclear magnetism in silver at positive and negative absolute temperatures in the low nanokelvin range
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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4
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Physical Review Letters, Volume 64, issue 22, pp. 2707-2710
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, P 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, vol. 64, no. 22, pp. 2707-2710. https://doi.org/10.1103/PhysRevLett.64.2707