Nuclear magnetism in silver at positive and negative absolute temperatures in the low nanokelvin range

P. J. Hakonen*, S. Yin, O. V. Lounasmaa

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

42 Citations (Scopus)
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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.

Original languageEnglish
Pages (from-to)2707-2710
Number of pages4
JournalPhysical Review Letters
Volume64
Issue number22
DOIs
Publication statusPublished - 1990
MoE publication typeA1 Journal article-refereed

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