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Sr_2RuO_4の超伝導および常伝導状態の異方的特性
https://doi.org/10.11501/3119765
https://doi.org/10.11501/3119765097b84c8-b90a-4862-9efa-1f7a52bd5174
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
diss_ko1435.pdf (22.0 MB)
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| Item type | デフォルトアイテムタイプ_（フル）(1) | |||||||||
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| 公開日 | 2023-03-18 | |||||||||
| タイトル | ||||||||||
| タイトル | Higtly anisotropic superconducting and normal-state properties of Sr_2RuO_4 | |||||||||
| 言語 | en | |||||||||
| タイトル | ||||||||||
| タイトル | Sr_2RuO_4の超伝導および常伝導状態の異方的特性 | |||||||||
| 言語 | ja | |||||||||
| 作成者 |
吉田, 宏二
× 吉田, 宏二
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| アクセス権 | ||||||||||
| アクセス権 | open access | |||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||
| 権利情報 | ||||||||||
| 権利情報 | Copyright(c) by Author | |||||||||
| 主題 | ||||||||||
| 主題Scheme | NDC | |||||||||
| 主題 | 420 | |||||||||
| 内容記述 | ||||||||||
| 内容記述 | We have recently discovered superconductivity of Sr2RuO4 with Tc ≈ 1 K. This compound is the only layered perovskite superconductor without copper that is known so far: the same crystal structure as a high-Tc superconducting copper oxide. In this study, we have investigated the superconducting and normal-state properties of Sr2RuO4 by measuring the electrical resistivity, magnetic susceptibility and specific heat using single crystals. In the normal state we found the T2 dependence of the resistivity below 25 K, the enhanced paramagnetic spin susceptibility, and the enhanced Sommerfeld coefficient of the specific heat. These three results can consistently be described as a highly-anisotropic Fermi-liquid behavior of the normal state of Sr2RuO4. In addition, concerning the peculiar temperature dependence of the resistivity along the c axis, we present a systematic interpretation based on competition between the life time of the quasiparticles governed by a number of scattering processes and the time for the quasiparticles to travel the interlayer distance d. From the upper critical fields Hc2, we will show that the superconducting state of Sr2RuO4 is also highly anisotropic with the ratio of the coherence lengths Γs = ξab(0)/ξc(0) = 26 evaluated for zero temperature. Furthermore, we found peculiar anisotropic flux-pinning behavior: a second dissipation peak in the ac susceptibility prominently appears only when the direction of the flux lines, as well as of their induced motions, is parallel to the ab planes. The peak effect in Sr2RuO4 is attributed to the synchronization of the flux lines to the pinning centers as the flux-line lattice softens with increasing magnetic field and temperature. In this study we clarify that Sr2RuO4 serves as an ideal reference material for investigation of the limits of applicability of the Fermi liquid theory to other highly correlated layered compounds, including high-Tc cuprates. In addition, the comparison with these physical properties of Sr2RuO4 and those of high-Tc superconductors are very important to clarify the mechanism of the high Tc, which still remains unclear at present. | |||||||||
| 言語 | en | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | TableOfContents | |||||||||
| 内容記述 | Abstract / p1 Contents / p2 1.Introduction / p3 2.Experimental / p6 2.1 Sample preparation / p6 2.2 Measurements / p6 3.Normal-State Properties / p7 3.1 Experimental results / p7 3.2 Highly anisotropic Fermi liquid state / p9 3.3 Anomalous temperature dependence of resistivity along the c axis / p10 4.Superconducting Properties / p15 4.1 Anisotropic superconducting state / p15 4.2 Peculiar flux pinning in the mixed state / p17 5.Conclusions / p23 Acknowledgments / p25 References / p26 | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||||
| 資源タイプ | doctoral thesis | |||||||||
| 出版タイプ | ||||||||||
| 出版タイプ | NA | |||||||||
| 出版タイプResource | http://purl.org/coar/version/c_be7fb7dd8ff6fe43 | |||||||||
| ID登録 | ||||||||||
| ID登録 | 10.11501/3119765 | |||||||||
| ID登録タイプ | JaLC | |||||||||
| 関連情報 | ||||||||||
| 関連タイプ | references | |||||||||
| 関連名称 | Anisotropic superconductivity of Sr2RuO4, K. Yoshida, Y. Maeno, S. Nishizaki and T. Fujita, to be published in Physica C. | |||||||||
| 関連情報 | ||||||||||
| 関連タイプ | references | |||||||||
| 識別子タイプ | DOI | |||||||||
| 関連識別子 | http://dx.doi.org/10.1016/0921-4534(95)00728-8 | |||||||||
| 開始ページ | ||||||||||
| 開始ページ | 1 | |||||||||
| 書誌情報 |
p. 1 |
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| 学位授与番号 | ||||||||||
| 学位授与番号 | 甲第1435号 | |||||||||
| 学位名 | ||||||||||
| 言語 | ja | |||||||||
| 学位名 | 博士(理学) | |||||||||
| 学位名 | ||||||||||
| 言語 | en | |||||||||
| 学位名 | Physical Science | |||||||||
| 学位授与年月日 | ||||||||||
| 学位授与年月日 | 1996-03-26 | |||||||||
| 学位授与機関 | ||||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||||
| 学位授与機関識別子 | 15401 | |||||||||
| 言語 | ja | |||||||||
| 学位授与機関名 | 広島大学 | |||||||||
| 学位授与機関 | ||||||||||
| 言語 | en | |||||||||
| 学位授与機関名 | Hiroshima University | |||||||||
| 旧ID | 31864 | |||||||||
