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ヤマガミ ヒロシ
YAMAGAMI HIROSHI
山上 浩志 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 1999/11/15 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Fermi surface and de Haas-van Alphen oscillation in both the normal and superconducting mixed states of UPd2Al3 |
| 執筆形態 | その他 |
| 掲載誌名 | Journal of the Physical Society of Japan |
| 出版社・発行元 | Physical Society of Japan |
| 巻・号・頁 | 68(11),3643-3654頁 |
| 著者・共著者 | Yoshihiko Inada,Hiroshi Yamagami,Yoshinori Haga,Kenji Sakurai,Yoshihumi Tokiwa,Tetsuo Honma,Etsuji Yamamoto,Yoshichika Onuki,Takashi Yanagisawa |
| 概要 | The dHvA oscillation was observed clearly in both the normal and superconducting mixed states for UPd2Al3 with the hexagonal structure. Eight kinds of dHvA branches were detected, which are well explained by the results of band calculations based on a fully-relativistic spin-polarized LAPW method. An inner orbit of a band 41-hole Fermi surface, named ζ, has the largest dHvA frequency of 9.45 × 107 Oe and cyclotron mass of 65 m0, reflecting a large electronic specific heat coefficient of 145 mJ/K2·mol. Branch α of a band 40-hole Fermi surface was observed in both the normal and superconducting mixed states, where the dHvA frequency does not change in magnitude between the normal and mixed states. The cyclotron effective mass of branch α is, however, found to be reduced and the corresponding Dingle temperature or scattering rate of the conduction electron increases with decreasing the field in the mixed state. An anisotropic energy gap with a line node for UPd2Al3 is discussed from the angular dependence of the dHvA amplitude in the mixed state. |
| DOI | 10.1143/JPSJ.68.3643 |
| ISSN | 0031-9015/1347-4073 |
| PermalinkURL | http://journals.jps.jp/doi/pdf/10.1143/JPSJ.68.3643 |