Thermal conductivity and torsional oscillations of solid ⁴He
Polycrystalline samples of hcp ⁴He of molar volume Vm = 19.5 cm³ with small amount of ³He impurities were grown in an annular container by the blocked-capillary method. Three concentrations of ³He, x₃, were studied: isotopically purified ⁴He with the estimated x₃ < 10⁻¹⁰, commercial ‘well-grade...
Збережено в:
| Опубліковано в: : | Физика низких температур |
|---|---|
| Дата: | 2012 |
| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2012
|
| Теми: | |
| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/117966 |
| Теги: |
Додати тег
Немає тегів, Будьте першим, хто поставить тег для цього запису!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Thermal conductivity and torsional oscillations of solid ⁴He/ M.Yu. Brazhnikov, D.E. Zmeev, A.I. Golov // Физика низких температур. — 2012. — Т. 38, № 11. — С. 1329–1335. — Бібліогр.: 29 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
nasplib_isofts_kiev_ua-123456789-117966 |
|---|---|
| record_format |
dspace |
| spelling |
Brazhnikov, M.Yu. Zmeev, D.E. Golov, A.I. 2017-05-27T18:20:52Z 2017-05-27T18:20:52Z 2012 Thermal conductivity and torsional oscillations of solid ⁴He/ M.Yu. Brazhnikov, D.E. Zmeev, A.I. Golov // Физика низких температур. — 2012. — Т. 38, № 11. — С. 1329–1335. — Бібліогр.: 29 назв. — англ. 0132-6414 PACS: 67.80.bd, 65.40.–b https://nasplib.isofts.kiev.ua/handle/123456789/117966 Polycrystalline samples of hcp ⁴He of molar volume Vm = 19.5 cm³ with small amount of ³He impurities were grown in an annular container by the blocked-capillary method. Three concentrations of ³He, x₃, were studied: isotopically purified ⁴He with the estimated x₃ < 10⁻¹⁰, commercial ‘well-grade’ helium with x₃ ~ 3⋅10⁻⁷ and a mixture with x₃ = 2.5⋅10⁻⁶. Torsional oscillations at two frequencies, 132.5 and 853.6 Hz, and thermal conductivity were investigated before and after annealing. The solid helium under investigation was located not only in the annular container but also in the axial fill line inside two torsion rods and dummy bob of the doublefrequency torsional oscillator. The analysis of the frequency shifts upon loading with helium and changing temperatures of different parts of the oscillator suggests that the three techniques probe the properties of solid helium in three different locations: the two different torsion modes respond to the changes of the shear modulus of solid helium in either of the two torsion rods while the thermal conductivity probes the phonon mean free path in solid helium inside the annular container. The temperature and width of the torsional anomaly increase with increasing frequency and x₃. The phonon mean free path increases with increasing x3. Annealing typically resulted in an increased phonon mean free path but often in little change in the torsional oscillator response. While the magnitude of the torsional anomaly and phonon mean free path can be very different in different samples, no correlation was found between them. We thank P.V.E. McClintock for providing isotopically purified ⁴He, and R. Schanen for his contribution at the preparatory stage of the experiment, R. Schanen for his contribution at the preparatory stage of the experiment, and S. Gillot and M. Sellers for building the TO cell. This work was supported by the Engineering and Physical Sciences Research Council [grant number EP/H014691]. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур К 75-летию Л.П. Межова-Деглина Thermal conductivity and torsional oscillations of solid ⁴He Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Thermal conductivity and torsional oscillations of solid ⁴He |
| spellingShingle |
Thermal conductivity and torsional oscillations of solid ⁴He Brazhnikov, M.Yu. Zmeev, D.E. Golov, A.I. К 75-летию Л.П. Межова-Деглина |
| title_short |
Thermal conductivity and torsional oscillations of solid ⁴He |
| title_full |
Thermal conductivity and torsional oscillations of solid ⁴He |
| title_fullStr |
Thermal conductivity and torsional oscillations of solid ⁴He |
| title_full_unstemmed |
Thermal conductivity and torsional oscillations of solid ⁴He |
| title_sort |
thermal conductivity and torsional oscillations of solid ⁴he |
| author |
Brazhnikov, M.Yu. Zmeev, D.E. Golov, A.I. |
| author_facet |
Brazhnikov, M.Yu. Zmeev, D.E. Golov, A.I. |
| topic |
К 75-летию Л.П. Межова-Деглина |
| topic_facet |
К 75-летию Л.П. Межова-Деглина |
| publishDate |
2012 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
Polycrystalline samples of hcp ⁴He of molar volume Vm = 19.5 cm³ with small amount of ³He impurities
were grown in an annular container by the blocked-capillary method. Three concentrations of ³He, x₃, were studied:
isotopically purified ⁴He with the estimated x₃ < 10⁻¹⁰, commercial ‘well-grade’ helium with x₃ ~ 3⋅10⁻⁷ and
a mixture with x₃ = 2.5⋅10⁻⁶. Torsional oscillations at two frequencies, 132.5 and 853.6 Hz, and thermal conductivity
were investigated before and after annealing. The solid helium under investigation was located not only in
the annular container but also in the axial fill line inside two torsion rods and dummy bob of the doublefrequency
torsional oscillator. The analysis of the frequency shifts upon loading with helium and changing temperatures
of different parts of the oscillator suggests that the three techniques probe the properties of solid helium
in three different locations: the two different torsion modes respond to the changes of the shear modulus of solid
helium in either of the two torsion rods while the thermal conductivity probes the phonon mean free path in solid
helium inside the annular container. The temperature and width of the torsional anomaly increase with increasing
frequency and x₃. The phonon mean free path increases with increasing x3. Annealing typically resulted in an increased
phonon mean free path but often in little change in the torsional oscillator response. While the magnitude
of the torsional anomaly and phonon mean free path can be very different in different samples, no correlation
was found between them.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/117966 |
| citation_txt |
Thermal conductivity and torsional oscillations of solid ⁴He/ M.Yu. Brazhnikov, D.E. Zmeev, A.I. Golov // Физика низких температур. — 2012. — Т. 38, № 11. — С. 1329–1335. — Бібліогр.: 29 назв. — англ. |
| work_keys_str_mv |
AT brazhnikovmyu thermalconductivityandtorsionaloscillationsofsolid4he AT zmeevde thermalconductivityandtorsionaloscillationsofsolid4he AT golovai thermalconductivityandtorsionaloscillationsofsolid4he |
| first_indexed |
2025-12-07T20:03:50Z |
| last_indexed |
2025-12-07T20:03:50Z |
| _version_ |
1850881166030143488 |