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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 | 2008/02 |
| 形態種別 | 研究論文 |
| 標題 | Why can't experimentalists agree on the superconducting critical exponents? |
| 執筆形態 | その他 |
| 掲載誌名 | PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
| 出版社・発行元 | ELSEVIER SCIENCE BV |
| 巻・号・頁 | 468(4),pp.284-287 |
| 著者・共著者 | M. C. Sullivan,D. R. Strachan,Su Li,Hua Xu,K. Segawa,Yoichi Ando,Steven M. Anlage,C. J. Lobb |
| 概要 | The scaling analysis of voltage vs. current curves has been an invaluable tool in the study of the normal-superconducting phase transition, both in zero-field and in the vortex-glass transition in a field. However, we have recently shown that the conventional scaling analysis is too flexible to uniquely determine the critical parameters. We have also shown that extrinsic effects such as current noise, small magnetic fields (for the zero-field transition), and finite size effects can obscure and even destroy the three-dimensional phase transition. These factors have led to the wide range of values for the dynamic critical exponent z and the static critical exponent v reported in the literature, even for the zero-field transition. We have developed a criterion that removes the fiexibility in the scaling analysis and have conducted experiments to eliminate the extrinsic effects described above. Our results show that finite size effects, which obscure the phase transition in thin films, are absent in bulk, untwinned, single crystals. (c) 2007 Elsevier B.V. All rights reserved. |
| DOI | 10.1016/j.physc.2007.09.022 |
| ISSN | 0921-4534 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=39649097384&origin=inward |