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First-order phase transition characteristic of the high temperature metal–semiconductor transition in [Ca2CoO3]0.62[CoO2]

Byline: Jinguang Cheng (1), Yu Sui (1,2), Yang Wang (1), Xianjie Wang (1), Wenhui Su (1,2) Keywords: 73.50.Lw; 71.30.+h; 65.40.De Abstract: Transportation and thermodynamic properties of misfit-layered polycrystalline [[Ca.sub.2]CoO.sub.3].sub.0.62[CoO.sub.2] were measured in order to clarify the na... Full description

Journal Title: Applied Physics A 3/2009, Vol.94(4), pp.911-916
Main Author: Cheng, Jinguang
Other Authors: Sui, Yu , Wang, Yang , Wang, Xianjie , Su, Wenhui
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: Springer (via CrossRef)
ID: ISSN: 0947-8396 ; E-ISSN: 1432-0630 ; DOI: http://dx.doi.org/10.1007/s00339-008-4849-8
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recordid: crossref10.1007/s00339-008-4849-8
title: First-order phase transition characteristic of the high temperature metal–semiconductor transition in [Ca2CoO3]0.62[CoO2]
format: Article
creator:
  • Cheng, Jinguang
  • Sui, Yu
  • Wang, Yang
  • Wang, Xianjie
  • Su, Wenhui
subjects:
  • Semiconductor Industry
  • Thermodynamics
ispartof: Applied Physics A, 3/2009, Vol.94(4), pp.911-916
description: Byline: Jinguang Cheng (1), Yu Sui (1,2), Yang Wang (1), Xianjie Wang (1), Wenhui Su (1,2) Keywords: 73.50.Lw; 71.30.+h; 65.40.De Abstract: Transportation and thermodynamic properties of misfit-layered polycrystalline [[Ca.sub.2]CoO.sub.3].sub.0.62[CoO.sub.2] were measured in order to clarify the nature of metal-- semiconductor transition (MST) at T .sub.MS[approximately equal to]400 K, above which the simultaneous decrease of resistivity and increase of thermopower with temperature give rise to a great enhancement of thermoelectric power factor up to 1000 K. A first-order phase transition characteristic around T .sub.MS was revealed by anomalies of resistivity, differential scanning calorimetry, and thermal expansion. The first-order characteristic of the MST can be rationalized from the Virial theorem at an itinerant to localized electron transition in the narrow e .sup.T band within the [CoO.sub.2] plane. Above T .sub.MS, the reduction of the retained delocalized states within the matrix of localized states and the enhancement of charge carrier effective mass with increasing temperature might account for the considerable enhancement of the thermopower. Author Affiliation: (1) Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, 150001, People's Republic of China (2) International Center for Materials Physics, Chinese Academy of Sciences, Shenyang, 110016, People's Republic of China Article History: Registration Date: 25/07/2008 Received Date: 10/12/2007 Accepted Date: 17/07/2008 Online Date: 19/08/2008
language: eng
source: Springer (via CrossRef)
identifier: ISSN: 0947-8396 ; E-ISSN: 1432-0630 ; DOI: http://dx.doi.org/10.1007/s00339-008-4849-8
fulltext: fulltext
issn:
  • 09478396
  • 0947-8396
  • 14320630
  • 1432-0630
url: Link


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descriptionByline: Jinguang Cheng (1), Yu Sui (1,2), Yang Wang (1), Xianjie Wang (1), Wenhui Su (1,2) Keywords: 73.50.Lw; 71.30.+h; 65.40.De Abstract: Transportation and thermodynamic properties of misfit-layered polycrystalline [[Ca.sub.2]CoO.sub.3].sub.0.62[CoO.sub.2] were measured in order to clarify the nature of metal-- semiconductor transition (MST) at T .sub.MS[approximately equal to]400 K, above which the simultaneous decrease of resistivity and increase of thermopower with temperature give rise to a great enhancement of thermoelectric power factor up to 1000 K. A first-order phase transition characteristic around T .sub.MS was revealed by anomalies of resistivity, differential scanning calorimetry, and thermal expansion. The first-order characteristic of the MST can be rationalized from the Virial theorem at an itinerant to localized electron transition in the narrow e .sup.T band within the [CoO.sub.2] plane. Above T .sub.MS, the reduction of the retained delocalized states within the matrix of localized states and the enhancement of charge carrier effective mass with increasing temperature might account for the considerable enhancement of the thermopower. Author Affiliation: (1) Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, 150001, People's Republic of China (2) International Center for Materials Physics, Chinese Academy of Sciences, Shenyang, 110016, People's Republic of China Article History: Registration Date: 25/07/2008 Received Date: 10/12/2007 Accepted Date: 17/07/2008 Online Date: 19/08/2008
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date2009-03