Temperature and Frequency Dependence of the Sound Velocity in hcp 4He Crystals
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- Iwasa Izumi
- Department of Physics, Faculty of Science, University of Tokyo
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- Araki Keisuke
- Department of Physics, Faculty of Science, University of Tokyo
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- Suzuki Hideji
- Department of Physics, Faculty of Science, University of Tokyo
書誌事項
- タイトル別名
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- Temperature and Frequency Dependence of The Sound Velocity in hcp <SUP>4</SUP>He Crystals
- Temperature and Frequency Dependence of
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The longitudinal sound velocity in hcp 4He single crystals grown at 35.5 atm has been measured between 0.25 and 1.7 K at 10, 30, and 50 MHz. Above about 1 K, the change in the velocity is proportional to T4 and independent of the frequency. Below 1 K the velocity change varies from crystal to crystal, depends on the frequency, and shows an annealing effect. These anomalous behaviors are caused by the interaction between the sound and the vibration of dislocations. The dislocation density Λ, the average pinning length L, and the damping constant B are obtained using the Granato-Lücke theory. Typical values are Λ=106 cm−2, L=5·10−4 cm, and B=3·10−7·T3 cgs when an exponential distribution for the pinning lengths is assumed. The choice of other distributions is discussed as well. Also discussed is the sound attenuation due to the dislocation vibration.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 46 (4), 1119-1126, 1979
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390282679165841664
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- NII論文ID
- 210000087727
- 110001975502
- 130003737759
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- NII書誌ID
- AA00704814
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- BIBCODE
- 1979JPSJ...46.1119I
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- COI
- 1:CAS:528:DyaE1MXitFSgs7k%3D
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 2048135
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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