1.

論文(リポジトリ)

論文(リポジトリ)
仲間, 隆男 ; 大吉, 隆文 ; 辺士, 正人 ; 玉城, 純孝 ; 内間, 清晴 ; Burkov, A.T. ; 矢ヶ崎, 克馬 ; Nakama, Takao ; Oyoshi, Takafumi ; Hedo, Masato ; Tamashiro, Junko ; Uchima, Kiyoharu ; Burkov, Alxander T. ; Yagasaki, Katsuma
出版情報: 琉球大学理学部紀要 — Bulletin of the College of Science. University of the Ryukyus.  pp.11-20,  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/9288
概要: The experimental set-up for simultaneous measurements of electrical resistivity and thermopower in the temperature range between room temperature and 1300 K was developed.\n The mechanical contacts of thermocouples, current leads and potential probes with sample were Utilized make it possible to measure a large variety of materials and result in a flexibility with respect to the sample form and dimension.\n The resistivity and thermopower of pure Ni, CeB_6 heavy fermion compound and a Cr-Si thin film composite are presented as test material to demonstrate the possibilities and accuracy of our experimental set-up.
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2.

論文(リポジトリ)

論文(リポジトリ)
矢ヶ崎, 克馬 ; 幾島, 康夫 ; 照屋, 全次 ; 当山, 忠久 ; Yagasaki, Katsuma ; Ikushima, Yasuo ; Teruya, Zenji ; Toyama, Tadahisa
出版情報: 琉球大学理学部紀要 — Bulletin of the College of Science. University of the Ryukyus.  pp.15-23,  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/9588
概要: The Planck's constant has been measured in the practical training of the special course of physics with an equipment usi ng white light with color filters, but, according to the instruction, the results obtained were very poor. In this investigation, the critical photo-current coinside with the critical wave length of the color filter is determined reasonably by knowing the wave length dependences of the intensity of radiation of the white light source and the sensitivity of electron emission of the phototube and the decreasing of the reaching ratio of photo-electrons with higher energy than that of the inverse field from the photo - electric surface to the anode. The logarithmic method is the most suitable for determination of the critical photo-current. The values obtained with this method are within 3% of error compared with the accurate value. At the same time, the differential method and that using the line spectrum source are performed with a fair accuracy.
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3.

論文(リポジトリ)

論文(リポジトリ)
仲村, 大 ; 辺土, 正人 ; 高江洲, 義尚 ; 内間, 清晴 ; 矢ヶ崎, 克馬 ; 仲間, 隆男 ; 藤原, 哲也 ; 繁岡, 透 ; Nakamura, Dai ; Hedo, Masato ; Takaesu, Yoshinao ; Uchima, Kiyoharu ; Yagasaki, Katsuma ; Nakama, Takao ; Fujiwara, Tetsuya ; Shigeoka, Toru
出版情報: 琉球大学理学部紀要 — Bulletin of the College of Science. University of the Ryukyus.  pp.1-8,  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/21887
概要: We have developed a set-up with modified "seesaw heating method" for the simultaneous measurement of thermopower S and e lectrical resistivity р under hydrostatic pressures P up to 3 GPa at the temperature range between 1.5 K and 300 K. By using this set-up, S and р of single crystalline YbMn_2Ge_2 and EuCo_2P_2 under high pressure were measured with enough accuracy. The temperature dependences of S and р show drastic changes at the critical pressure P_c in both compounds. The measurement results indicate that the simultaneous measurement of S and р is a usuful tool to study the pressure-induced phase transitions.
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4.

論文(リポジトリ)

論文(リポジトリ)
高江洲, 義尚 ; 仲間, 隆男 ; 辺土, 正人 ; 内間, 清晴 ; 矢ヶ崎, 克馬 ; A. T. Burkov ; Takaesu, Yoshinao ; Nakama, Takao ; Hedo, Masato ; Uchima, Kiyoharu ; Yagasaki, Katsuma
出版情報: 琉球大学理学部紀要 — Bulletin of the College of Science. University of the Ryukyus.  pp.1-6,  琉球大学理学部
URL: http://hdl.handle.net/20.500.12000/22107
概要: Electrical resistivity p and thermopower S of Y_<1-x>R_xCo_2 (R=Gd, Tb, Dy, Ho and Er) Laves phase systems were measured at temperatures from 1.5 K to 300 K in magnetic fields up to 15 T and under hydrostatic pressures up to 2 GPa. The universal linear relation between the pressure and magnetic field derivatives of the resistivity, dp/dP vs. dp/dB, was observed in the Y_<1-x>R_xCo_2 systems. Similar scaling behavior was found for the thermopower dependence on pressure and magnetic field.
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