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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| Дата: | 2008 |
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| Автори: | , , |
| 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 видання: | Физика низких температур |
| Теми: | |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/116908 |
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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. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
irk-123456789-116908 |
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irk-123456789-1169082017-05-19T03:02:30Z Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He Syshchenko, A. Day, J. Beamish, J. Твердый гелий 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. 2008 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/116908 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Твердый гелий Твердый гелий |
| spellingShingle |
Твердый гелий Твердый гелий Syshchenko, A. Day, J. Beamish, J. Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He Физика низких температур |
| 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. |
| format |
Article |
| author |
Syshchenko, A. Day, J. Beamish, J. |
| author_facet |
Syshchenko, A. Day, J. Beamish, J. |
| author_sort |
Syshchenko, A. |
| title |
Defects and supersolidity: effects of annealing and stress on elastic behavior of solid ⁴He |
| 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 |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2008 |
| topic_facet |
Твердый гелий |
| url |
http://dspace.nbuv.gov.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. |
| series |
Физика низких температур |
| work_keys_str_mv |
AT syshchenkoa defectsandsupersolidityeffectsofannealingandstressonelasticbehaviorofsolid4he AT dayj defectsandsupersolidityeffectsofannealingandstressonelasticbehaviorofsolid4he AT beamishj defectsandsupersolidityeffectsofannealingandstressonelasticbehaviorofsolid4he |
| first_indexed |
2023-10-18T20:28:34Z |
| last_indexed |
2023-10-18T20:28:34Z |
| _version_ |
1796150298150961152 |