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

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Abstract

Transportation and thermodynamic properties of misfit-layered polycrystalline [Ca2CoO3]0.62[CoO2] were measured in order to clarify the nature of metal– semiconductor transition (MST) at T MS≈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 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 T band within the [CoO2] plane. Above T 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.

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Authors and Affiliations

  1. Center for Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Jinguang Cheng, Yu Sui, Yang Wang, Xianjie Wang & Wenhui Su

  2. International Center for Materials Physics, Chinese Academy of Sciences, Shenyang, 110016, People’s Republic of China

    Yu Sui & Wenhui Su

Authors
  1. Jinguang Cheng
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  2. Yu Sui
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  3. Yang Wang
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  4. Xianjie Wang
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  5. Wenhui Su
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Correspondence to Yu Sui.

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Cheng, J., Sui, Y., Wang, Y. et al. First-order phase transition characteristic of the high temperature metal–semiconductor transition in [Ca2CoO3]0.62[CoO2]. Appl. Phys. A 94, 911–916 (2009). https://doi.org/10.1007/s00339-008-4849-8

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  • DOI: https://doi.org/10.1007/s00339-008-4849-8

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