|
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 | 2002/12 |
| 形態種別 | 研究論文 |
| 標題 | Magnetotransport properties of untwinned YBa2Cu3Oy single crystals: novel 60-K-phase anomalies in the charge transport |
| 執筆形態 | その他 |
| 掲載誌名 | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS |
| 出版社・発行元 | PERGAMON-ELSEVIER SCIENCE LTD |
| 巻・号・頁 | 63(12),pp.2253-2257 |
| 著者・共著者 | Y Ando,K Segawa |
| 概要 | We present the result of our accurate measurements of the a- and b-axis resistivity (rho(a) and rho(b)), magnetoconductivity Deltasigma/sigma, Hall coefficient R-H, and the alpha-axis thermopower S-a in untwinned YBa2Cu3Oy single crystals in a wide range of doping (6.45 less than or equal to y less than or equal to 7.0). The systematics of our data reveals a number of novel 60-K-phase anomalies in the charge transport: (i) temperature dependences of rho(a) show anomalous overlap below similar to130 K for 6.65 less than or equal to y less than or equal to 6.80, (ii) Hall mobility mu(H) shows an enhancement near y 6.65, which is reflected in an anomalous y dependence of sigma(xy), (iii) with decreasing temperature R-H shows a marked drop upon approaching T-c only in samples with 6.70 less than or equal to y less than or equal to 6.85, (iv) superconducting fluctuation magnetoconductivity is anomalously enhanced near y similar or equal to 6.7, and (v) H-c2 is anomalously reduced near y similar or equal to 6.70. We discuss that the fluctuating charge stripes might be responsible for these anomalies in the charge transport. (C) 2002 Published by Elsevier Science Ltd. |
| DOI | 10.1016/S0022-3697(02)00215-9 |
| ISSN | 0022-3697/1879-2553 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0036905777&origin=inward |