Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He
Recent measurements showed that solid ⁴He can decouple from a torsional oscillator below 200 mK and defects appear to be crucial to this behavior. Helium’s shear modulus increases in the same range, which can be understood in terms of dislocations pinned by ³He impurities at the lowest temperature...
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| Опубліковано в: : | Физика низких температур |
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| Дата: | 2008 |
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| Формат: | Стаття |
| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2008
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He / A. Syshchenko, J. Day, J. Beamish // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 427–430. — Бібліогр.: 31 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
nasplib_isofts_kiev_ua-123456789-116908 |
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Syshchenko, A. Day, J. Beamish, J. 2017-05-18T09:50:58Z 2017-05-18T09:50:58Z 2008 Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He / A. Syshchenko, J. Day, J. Beamish // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 427–430. — Бібліогр.: 31 назв. — англ. 0132-6414 PACS: 67.80.bd;67.80.dj;67.80.de https://nasplib.isofts.kiev.ua/handle/123456789/116908 Recent measurements showed that solid ⁴He can decouple from a torsional oscillator below 200 mK and defects appear to be crucial to this behavior. Helium’s shear modulus increases in the same range, which can be understood in terms of dislocations pinned by ³He impurities at the lowest temperatures, but mobile above 100 mK. We have measured helium’s pressure and shear modulus to study the effects of annealing and stresses applied at low temperatures. Pressure gradients produced during crystal growth or plastic deformation are greatly reduced by annealing, but only at temperatures close to melting. Annealing does not change the low-temperature modulus but usually raises it at high temperature, as expected if annealing eliminates some dislocations. Large stresses also affect the modulus, but these changes are reversed by heating above 0.5 K, suggesting that defects introduced by stress are easier to anneal than those produced during growth. We would like to thank the Natural Sciences and Engineering Research Council of Canada and the University of Alberta for support of this research and M.H.W. Chan for providing the TO data of Fig. 1. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Твердый гелий Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He |
| spellingShingle |
Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He Syshchenko, A. Day, J. Beamish, J. Твердый гелий |
| title_short |
Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He |
| title_full |
Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He |
| title_fullStr |
Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He |
| title_full_unstemmed |
Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He |
| title_sort |
defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴he |
| author |
Syshchenko, A. Day, J. Beamish, J. |
| author_facet |
Syshchenko, A. Day, J. Beamish, J. |
| topic |
Твердый гелий |
| topic_facet |
Твердый гелий |
| publishDate |
2008 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
Recent measurements showed that solid ⁴He can decouple from a torsional oscillator below 200 mK and
defects appear to be crucial to this behavior. Helium’s shear modulus increases in the same range, which can
be understood in terms of dislocations pinned by ³He impurities at the lowest temperatures, but mobile
above 100 mK. We have measured helium’s pressure and shear modulus to study the effects of annealing and
stresses applied at low temperatures. Pressure gradients produced during crystal growth or plastic deformation
are greatly reduced by annealing, but only at temperatures close to melting. Annealing does not change
the low-temperature modulus but usually raises it at high temperature, as expected if annealing eliminates
some dislocations. Large stresses also affect the modulus, but these changes are reversed by heating above
0.5 K, suggesting that defects introduced by stress are easier to anneal than those produced during growth.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/116908 |
| citation_txt |
Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He / A. Syshchenko, J. Day, J. Beamish // Физика низких температур. — 2008. — Т. 34, № 4-5. — С. 427–430. — Бібліогр.: 31 назв. — англ. |
| work_keys_str_mv |
AT syshchenkoa defectsandsupersolidityeffectsofannealingandstressonelasticbehaviorofsolid4he AT dayj defectsandsupersolidityeffectsofannealingandstressonelasticbehaviorofsolid4he AT beamishj defectsandsupersolidityeffectsofannealingandstressonelasticbehaviorofsolid4he |
| first_indexed |
2025-11-29T01:28:08Z |
| last_indexed |
2025-11-29T01:28:08Z |
| _version_ |
1850854366910611456 |