| Project/Area Number |
61460041
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理学一般
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
MUSHA Toshimitsu The Graduate School at Nagatsuta, Tokyo Institute of Technology,Professor, 大学院総合理工学研究科, 教授 (70016319)
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Yoshiwo The Graduate School at Nagatsuta, Tokyo Institute of Technology,Assistant, 大学院総合理工学研究科, 助手 (20152358)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥5,600,000 (Direct Cost: ¥5,600,000)
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| Keywords | 1 / f fluctuations / Phonons / Dielectric loss fluctuations / Magnetic loss fluctuations / Triglycine sulfate / Rochelle salt |
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| Research Abstract |
1/f fluctuations which are observed as fluctuations in electrical resistance in thermal equilibrium are attributed to fluctuations in local mobility of the specimen. Furthermore, the mobility due to electron phonon scattering causes 1/f fluctuations, From these observations it is quite probable that linear response coefficient in general fluctuates as 1/f in thermal equilibrium. Based on this idea we have performed experiments on obsevation of dielectric constant and permeablity.
Ferroelectric materials, triglycine sulfate and Rochelle salt, and a ferromagnetic material, Gd, wew used as specimens. It is found that fluctuations of only the imaginary parts of the dielectric constant and the permeability of these materials show a 1/f spectrum. We have concluded that relaxation processes are fluctuating or relaxation amond thermal phonons have a 1/f spectrum.
For a direct observation of phonon fluctuations in thermal equilibrium, intensity fluctuations of Brillouin scattering light intensity by these materials were observed. However, we have not obtained reliable result as yet.
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