Exchange and spin relaxation in solid ³He
Spin relaxation measurements in solid ³He in the temperature region where exchange dominates the behavior are reviewed and reanalyzed. A model which brings together the complex exchange modulation of the dipolar interaction into a single correlation time is adopted. This may be regarded as introduci...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 1997 |
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| Format: | Artikel |
| Sprache: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
1997
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Exchange and spin relaxation in solid ³He / B. Cowan and M. Fardis // Физика низких температур. — 1997. — Т. 23, № 5-6. — С. 598-606. — Бібліогр.: 25 назв. — англ. |
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Cowan, Brian Fardis, Mihail 2021-02-01T16:34:05Z 2021-02-01T16:34:05Z 1997 Exchange and spin relaxation in solid ³He / B. Cowan and M. Fardis // Физика низких температур. — 1997. — Т. 23, № 5-6. — С. 598-606. — Бібліогр.: 25 назв. — англ. 0132-6414 PACS: 67.80.Jd https://nasplib.isofts.kiev.ua/handle/123456789/175528 Spin relaxation measurements in solid ³He in the temperature region where exchange dominates the behavior are reviewed and reanalyzed. A model which brings together the complex exchange modulation of the dipolar interaction into a single correlation time is adopted. This may be regarded as introducing an effective pairwise exchange Hamiltonian. On the basis of this model new procedures are proposed for obtaining mathematical expressions for the dipolar autocorrelation function and the spectral density functions, which determine the relaxation times. By the appropriate treatment of short-time and long-time asymptotic behavior, together with a method for taking into account the mid-range behavior, it is possible to fit the experimental data extremely well. The success of this procedure seems surprising in the light of multiple spin exchange in solid ³He. It is an indication that the dominant exchange processes scale with density in a similar way. This conclusion is supported by path-integral Monte Carlo calculations. Some consequences and implications of this conclusion are discussed. І am indebted to John Saunders for invaluable discussions in the preparation of this paper. І would also like to thank Воb Richardson and George Pickett for additional information on experimental aspects of some of the data quoted here. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Квантовые жидкости и квантовые кpисталлы Exchange and spin relaxation in solid ³He Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Exchange and spin relaxation in solid ³He |
| spellingShingle |
Exchange and spin relaxation in solid ³He Cowan, Brian Fardis, Mihail Квантовые жидкости и квантовые кpисталлы |
| title_short |
Exchange and spin relaxation in solid ³He |
| title_full |
Exchange and spin relaxation in solid ³He |
| title_fullStr |
Exchange and spin relaxation in solid ³He |
| title_full_unstemmed |
Exchange and spin relaxation in solid ³He |
| title_sort |
exchange and spin relaxation in solid ³he |
| author |
Cowan, Brian Fardis, Mihail |
| author_facet |
Cowan, Brian Fardis, Mihail |
| topic |
Квантовые жидкости и квантовые кpисталлы |
| topic_facet |
Квантовые жидкости и квантовые кpисталлы |
| publishDate |
1997 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
Spin relaxation measurements in solid ³He in the temperature region where exchange dominates the behavior are reviewed and reanalyzed. A model which brings together the complex exchange modulation of the dipolar interaction into a single correlation time is adopted. This may be regarded as introducing an effective pairwise exchange Hamiltonian. On the basis of this model new procedures are proposed for obtaining mathematical expressions for the dipolar autocorrelation function and the spectral density functions, which determine the relaxation times. By the appropriate treatment of short-time and long-time asymptotic behavior, together with a method for taking into account the mid-range behavior, it is possible to fit the experimental data extremely well. The success of this procedure seems surprising in the light of multiple spin exchange in solid ³He. It is an indication that the dominant exchange processes scale with density in a similar way. This conclusion is supported by path-integral Monte Carlo calculations. Some consequences and implications of this conclusion are discussed.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/175528 |
| citation_txt |
Exchange and spin relaxation in solid ³He / B. Cowan and M. Fardis // Физика низких температур. — 1997. — Т. 23, № 5-6. — С. 598-606. — Бібліогр.: 25 назв. — англ. |
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AT cowanbrian exchangeandspinrelaxationinsolid3he AT fardismihail exchangeandspinrelaxationinsolid3he |
| first_indexed |
2025-12-07T16:17:24Z |
| last_indexed |
2025-12-07T16:17:24Z |
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1850866919454801920 |