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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 | 1999 |
| 形態種別 | 研究論文 |
| 標題 | Specific-heat evidence for strong electron correlations in the thermoelectric material (Na, Ca)Co2O4 |
| 執筆形態 | その他 |
| 掲載誌名 | Physical Review B - Condensed Matter and Materials Physics |
| 巻・号・頁 | 60(15),pp.10580-10583 |
| 著者・共著者 | Yoichi Ando,N. Miyamoto,Kouji Segawa,T. Kawata,I. Terasaki |
| 概要 | The specific heat of (Na, Ca)Co2O4 is measured at low-temperatures to determine the magnitude of the electronic specific-heat coefficient γ, in an attempt to gain an insight into the origin of the unusually large thermoelectric power of this compound. It is found that γ is as large as 48mJ/molK2, which is an order of magnitude larger than γ of simple metals. This indicates that (Na, Ca)Co2O4 is a strongly-correlated electron system, where the strong correlation probably comes from the low-dimensionality and the frustrated spin structure. We discuss how the large thermopower and its dependence on Ca doping can be understood with the strong electron correlations. © 1999 The American Physical Society. |
| DOI | 10.1103/PhysRevB.60.10580 |
| ISSN | 1550-235X |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0001571997&origin=inward |