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
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
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