ログイン
言語:

WEKO3

  • トップ
  • ランキング
To
lat lon distance
To

Field does not validate



インデックスリンク

インデックスツリー

メールアドレスを入力してください。

WEKO

One fine body…

WEKO

One fine body…

アイテム

  1. 学部学科区分一覧
  2. 工学部・工学研究科
  1. 資料タイプ一覧
  2. 学術雑誌論文

Corrugated flat band as an origin of large thermopower in hole doped PtSb2

https://repository.lib.tottori-u.ac.jp/records/7093
https://repository.lib.tottori-u.ac.jp/records/7093
57a158da-2d6b-4dd2-b1b8-0a8e62e7380a
名前 / ファイル ライセンス アクション
aipa2_042108.pdf aipa2_042108.pdf (1.1 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2019-09-19
タイトル
タイトル Corrugated flat band as an origin of large thermopower in hole doped PtSb2
言語 en
言語
言語 eng
資源タイプ
資源タイプ journal article
著者 Mori, Kouta

× Mori, Kouta

WEKO 26212

en Mori, Kouta

Search repository
Usui, Hidetomo

× Usui, Hidetomo

WEKO 26213

en Usui, Hidetomo

Search repository
Sakakibara, Hirofumi

× Sakakibara, Hirofumi

WEKO 4724
e-Rad 20734354
研究者総覧鳥取大学 100001618

en Sakakibara, Hirofumi

Search repository
Kuroki, Kazuhiko

× Kuroki, Kazuhiko

WEKO 26214

en Kuroki, Kazuhiko

Search repository
著者所属(英)
言語 en
値 Department of Engineering Science, The University of Electro-Communications / JST, ALCA
著者所属(英)
言語 en
値 Department of Engineering Science, The University of Electro-Communications / JST, ALCA
著者所属(英)
言語 en
値 Department of Applied Physics and Chemistry, The University of Electro-Communications
著者所属(英)
言語 en
値 Department of Engineering Science, The University of Electro-Communications / JST, ALCA
抄録
内容記述タイプ Other
内容記述 The origin of the recently discovered large thermopower in hole-doped PtSb2 is theoretically analyzed based on a model constructed from first principles band calculation. It is found that the valence band dispersion has an overall flatness combined with some local ups and downs, which gives small Fermi surfaces scattered over the entire Brillouin zone. The Seebeck coefficient is calculated using this model, which gives good agreement with the experiment. We conclude that the good thermoelectric property originates from this “corrugated flat band”, where the coexistence of large Seebeck coefficient and large electric conductivity is generally expected. Good thermoelectric materials are those materials that can transform heat into electricity with high efficiency. The efficiency of thermoelectric materials is characterized by the dimensionless figure of merit, ZT, where T is the temperature, and Z = S2σ/κ with S, σ and κ being the Seebeck coefficient, electric conductivity, and the thermal conductivity, respectively.1 In particular, the product P = S2σ is called the power factor, and a material with large P requires a large S and σ. It is known, however, that materials with large Seebeck coefficient usually have small conductivity, so that good thermoelectric materials are often found in semiconducting materials with rather small amount of carriers. In this context, the discovery of good thermoelectric properties in the sodium cobaltate NaxCoO22 has been of special interest in that a large power factor is observed in a material with large amount of doped holes and thus metallic conductivity. There have been various theoretical studies on this material,3-6 and in particular, one of the present authors along with Arita proposed that a peculiar band shape named the “pudding mold type” (Fig. 1(b)) is the origin of this coexistence of good conductivity and large thermopower.6 Namely in a system having a band with flat portion at the top (or bottom), connecting into a dispersive portion, the Fermi level is kept close to the band edge upon doping, and this gives rise to a large group velocity difference between electrons and holes, resulting in a large Seebeck coefficient. At the same time, the large group velocity of holes due to the dispersive portion of the band gives a large electric conductivity, and this combination results in a large power factor.
書誌情報 AIP Advances
en : AIP Advances

巻 2, p. 042108, 発行日 2012-12-08
出版者
出版者 AIP Publishing LLC.
ISSN
収録物識別子タイプ ISSN
収録物識別子 21583226
DOI
関連タイプ isIdenticalTo
識別子タイプ DOI
関連識別子 10.1063/1.4759007
権利
権利情報 © Author(s) 2012. This article is distributed under a Creative Commons Attribution 3.0 Unported License(CC BY).
情報源
関連名称 K. Mori, H. Usui, H. Sakakibara and K. Kuroki. Corrugated flat band as an origin of large thermopower in hole doped PtSb2. AIP Advances. 2012, 2, 042108
関連サイト
識別子タイプ URI
関連識別子 https://aip.scitation.org/doi/10.1063/1.4759007
関連名称 https://aip.scitation.org/doi/10.1063/1.4759007
著者版フラグ
出版タイプ VoR
戻る
0
views
See details
Views

Versions

Ver.1 2023-08-02 06:26:55.729746
Show All versions

Share

Mendeley Twitter Facebook Print Addthis

Cite as

エクスポート

OAI-PMH
  • OAI-PMH JPCOAR 2.0
  • OAI-PMH JPCOAR 1.0
  • OAI-PMH DublinCore
  • OAI-PMH DDI
Other Formats
  • JSON
  • BIBTEX

Confirm


Powered by WEKO3


Powered by WEKO3