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セガワ コウジ
SEGAWA KOJI
瀬川 耕司 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2008 |
| 形態種別 | 研究論文（国際会議プロシーディングス） |
| 標題 | Pitfalls in the analysis of low-temperature thermal conductivity of high-Tc cuprates |
| 執筆形態 | その他 |
| 掲載誌名 | INTERNATIONAL SYMPOSIUM ON LATTICE EFFECTS IN CUPRATE HIGH TEMPERATURE SUPERCONDUCTORS (LEHTSC2007) |
| 掲載区分 | 国外 |
| 出版社・発行元 | IOP PUBLISHING LTD |
| 巻・号・頁 | 108 |
| 著者・共著者 | Y. Ando,X. F. Sun,K. Segawa |
| 概要 | Recently, it was proposed that phonons axe specularly reflected below similar to 0.5 K in ordinary single-crystal samples of high-T-c cuprates, and that the low-temperature thermal conductivity kappa, should be analyzed by fitting the data up to similar to 0.5 K with the formula kappa = aT + bT(alpha) where a is a fitting parameter. Such an analysis yields a result different from that obtained from the conventional analysis in which the fitting is restricted to a region below similar to 0.15 K, where kappa has been found to obey kappa = aT + bT(3) very well, which means that phonons are in the boundary scattering regime without specular reflection. Here we show that the proposed new analysis is most likely flawed, because the specular phonon reflection means that the phonon mean free path l gets longer than the mean sample width, while the estimated l is actually much shorter than the mean sample width above similar to 0.15 K. |
| DOI | 10.1088/1742-6596/108/1/012001 |
| ISSN | 1742-6588 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=44649143890&origin=inward |