Observations of Co4 + in a higher spin state and the increase in the seebeck coefficient of thermoelectric Ca 3Co 4O 9

R.F. Klie; Q. Qiao; T. Paulauskas; A. Gulec; Alejandro F. Rebola; Serdar Ogut; M.P.  Prange; Juan Carlos Idrobo; Sokrates T Pantelides; Stanislaw Kolesnik; Bogdan Dabrowski; Mustafa Ozdemir; Cihat Boyraz; Dipanjan Mazumdar; Arunava Gupta

doi:10.1103/PhysRevLett.108.196601

Observations of Co4 ⁺ in a higher spin state and the increase in the seebeck coefficient of thermoelectric Ca ₃Co ₄O ₉

R.F. Klie, Q. Qiao, T. Paulauskas, A. Gulec, Alejandro F. Rebola, Serdar Ogut, M.P. Prange, Juan Carlos Idrobo , Sokrates T Pantelides, Stanislaw Kolesnik, Bogdan Dabrowski, Mustafa Ozdemir, Cihat Boyraz, Dipanjan Mazumdar, Arunava Gupta

Research output: Contribution to journal › Article › Research › peer-review

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Abstract

Ca ₃Co ₄O ₉ has a unique structure that leads to exceptionally high thermoelectric transport. Here we report the achievement of a 27% increase in the room-temperature in-plane Seebeck coefficient of Ca ₃Co ₄O ₉ thin films. We combine aberration-corrected Z-contrast imaging, atomic-column resolved electron energy-loss spectroscopy, and density-functional calculations to show that the increase is caused by stacking faults with Co4 ⁺-ions in a higher spin state compared to that of bulk Ca ₃Co ₄O ₉. The higher Seebeck coefficient makes the Ca ₃Co ₄O ₉ system suitable for many high temperature waste-heat-recovery applications.

Original language	English
Article number	196601
Pages (from-to)	1-5
Number of pages	5
Journal	Physical Review Letters
Volume	108
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.108.196601
Publication status	Published - 8 May 2012
Externally published	Yes

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Klie, R. F., Qiao, Q., Paulauskas, T., Gulec, A., Rebola, A. F., Ogut, S., Prange, M. P., Idrobo , J. C., Pantelides, S. T., Kolesnik, S., Dabrowski, B., Ozdemir, M., Boyraz, C., Mazumdar, D., & Gupta, A. (2012). Observations of Co4 ⁺ in a higher spin state and the increase in the seebeck coefficient of thermoelectric Ca ₃Co ₄O ₉. Physical Review Letters, 108(19), 1-5. Article 196601. https://doi.org/10.1103/PhysRevLett.108.196601

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title = "Observations of Co4 + in a higher spin state and the increase in the seebeck coefficient of thermoelectric Ca 3Co 4O 9",

abstract = "Ca 3Co 4O 9 has a unique structure that leads to exceptionally high thermoelectric transport. Here we report the achievement of a 27% increase in the room-temperature in-plane Seebeck coefficient of Ca 3Co 4O 9 thin films. We combine aberration-corrected Z-contrast imaging, atomic-column resolved electron energy-loss spectroscopy, and density-functional calculations to show that the increase is caused by stacking faults with Co4 +-ions in a higher spin state compared to that of bulk Ca 3Co 4O 9. The higher Seebeck coefficient makes the Ca 3Co 4O 9 system suitable for many high temperature waste-heat-recovery applications.",

author = "R.F. Klie and Q. Qiao and T. Paulauskas and A. Gulec and Rebola, {Alejandro F.} and Serdar Ogut and M.P. Prange and Idrobo, {Juan Carlos} and Pantelides, {Sokrates T} and Stanislaw Kolesnik and Bogdan Dabrowski and Mustafa Ozdemir and Cihat Boyraz and Dipanjan Mazumdar and Arunava Gupta",

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doi = "10.1103/PhysRevLett.108.196601",

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Klie, RF, Qiao, Q, Paulauskas, T, Gulec, A, Rebola, AF, Ogut, S, Prange, MP, Idrobo , JC, Pantelides, ST, Kolesnik, S, Dabrowski, B, Ozdemir, M, Boyraz, C, Mazumdar, D & Gupta, A 2012, 'Observations of Co4 ⁺ in a higher spin state and the increase in the seebeck coefficient of thermoelectric Ca ₃Co ₄O ₉', Physical Review Letters, vol. 108, no. 19, 196601, pp. 1-5. https://doi.org/10.1103/PhysRevLett.108.196601

TY - JOUR

T1 - Observations of Co4 + in a higher spin state and the increase in the seebeck coefficient of thermoelectric Ca 3Co 4O 9

AU - Klie, R.F.

AU - Qiao, Q.

AU - Paulauskas, T.

AU - Gulec, A.

AU - Rebola, Alejandro F.

AU - Ogut, Serdar

AU - Prange, M.P.

AU - Idrobo , Juan Carlos

AU - Pantelides, Sokrates T

AU - Kolesnik, Stanislaw

AU - Dabrowski, Bogdan

AU - Ozdemir, Mustafa

AU - Boyraz, Cihat

AU - Mazumdar, Dipanjan

AU - Gupta, Arunava

PY - 2012/5/8

Y1 - 2012/5/8

N2 - Ca 3Co 4O 9 has a unique structure that leads to exceptionally high thermoelectric transport. Here we report the achievement of a 27% increase in the room-temperature in-plane Seebeck coefficient of Ca 3Co 4O 9 thin films. We combine aberration-corrected Z-contrast imaging, atomic-column resolved electron energy-loss spectroscopy, and density-functional calculations to show that the increase is caused by stacking faults with Co4 +-ions in a higher spin state compared to that of bulk Ca 3Co 4O 9. The higher Seebeck coefficient makes the Ca 3Co 4O 9 system suitable for many high temperature waste-heat-recovery applications.

AB - Ca 3Co 4O 9 has a unique structure that leads to exceptionally high thermoelectric transport. Here we report the achievement of a 27% increase in the room-temperature in-plane Seebeck coefficient of Ca 3Co 4O 9 thin films. We combine aberration-corrected Z-contrast imaging, atomic-column resolved electron energy-loss spectroscopy, and density-functional calculations to show that the increase is caused by stacking faults with Co4 +-ions in a higher spin state compared to that of bulk Ca 3Co 4O 9. The higher Seebeck coefficient makes the Ca 3Co 4O 9 system suitable for many high temperature waste-heat-recovery applications.

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DO - 10.1103/PhysRevLett.108.196601

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VL - 108

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 19

M1 - 196601

ER -

Observations of Co4 + in a higher spin state and the increase in the seebeck coefficient of thermoelectric Ca 3Co 4O 9

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Observations of Co4 ⁺ in a higher spin state and the increase in the seebeck coefficient of thermoelectric Ca ₃Co ₄O ₉