Negative Absolute Temperatures: 'Hot' Spins in Spontaneous Magnetic Order
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© 1994 American Association for the Advancement of Science (AAAS). This is the preprint version of the article: Hakonen, Pertti J. & Lounasmaa, Olli V. 1994. Negative Absolute Temperatures: 'Hot' Spins in Spontaneous Magnetic Order. Science. Volume 265, Issue 5180. 1-29. DOI: 10.1126/science.265.5180.1821.
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School of Science |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors
Date
1994
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Mcode
Degree programme
Language
en
Pages
1-29
Series
Science, Volume 265, Issue 5180
Abstract
Depending on the sign of the spin temperature, +-T, in the picokelvin range, antiferro- and ferromagnetic nuclear order in silver are caused by the same interactions. In rhodium, the antiferromagnetic state is preferred both at T > 0 and at T < 0. The lowest and 'highest' temperatures ever produced and measured, 280 pK and -750 pK, have been reached in the course of these experiments. The results on silver, in particular, show that negative temperatures are real, not fictitious quantities.Description
Keywords
negative absolute temperatures, spontaneous magnetic order
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Citation
Hakonen, Pertti J. & Lounasmaa, Olli V. 1994. Negative Absolute Temperatures: 'Hot' Spins in Spontaneous Magnetic Order. Science. Volume 265, Issue 5180. 1-29. DOI: 10.1126/science.265.5180.1821