Observation of nuclear ferromagnetic ordering in silver at negative nanokelvin temperatures
| Autor: | Pertti Hakonen, O. V. Lounasmaa, R. T. Vuorinen, K. K. Nummila |
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| Přispěvatelé: | Perustieteiden korkeakoulu, School of Science, Teknillisen fysiikan laitos, Department of Applied Physics, Aalto-yliopisto, Aalto University |
| Rok vydání: | 1992 |
| Předmět: |
Materials science
Condensed matter physics Physics Exchange interaction Demagnetizing field negative temperatures General Physics and Astronomy nuclear magnetism Magnetic susceptibility Magnetic field ferromagnetic ordering Ferromagnetism Mean field theory Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Phase diagram |
| Zdroj: | Physical Review Letters. 68:365-368 |
| ISSN: | 0031-9007 |
| DOI: | 10.1103/physrevlett.68.365 |
| Popis: | The ferromagnetically ordered state in the nuclear spin system of silver has been reached at negative absolute temperatures by adiabatic nuclear demagnetization at entropies below 0.82 ln2. The ordering, caused by the antiferromagnetic Ruderman-Kittel interaction, was observed below -1.9 nK as a saturation of susceptibility close to -1 and as an increase of the NMR frequencies. Comparison with recent mean-field calculations by Viertiö and Oja suggests a domain configuration. The phase diagram of silver nuclei at T |
| Databáze: | OpenAIRE |
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