Staging model of the ordered stacking of vacancy layers and phase separation in layered Nax CoO2 (x0.71) single crystals

G. J. Shu; F. T. Huang; M. W. Chu; Jiunn-Yuan Lin; Patrick A. Lee; F. C. Chou

doi:10.1103/PhysRevB.80.014117

Staging model of the ordered stacking of vacancy layers and phase separation in layered Nax CoO2 (x0.71) single crystals

G. J. Shu, F. T. Huang, M. W. Chu, Jiunn-Yuan Lin, Patrick A. Lee, F. C. Chou

Institute of Physics

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

14 Scopus citations

Abstract

Phase diagram of Nax CoO2 (x0.71) has been reinvestigated using electrochemically fine-tuned single crystals. Both phase-separation and staging phenomena as a result of sodium multivacancy cluster ordering have been found. Phase-separation phenomenon is observed in the narrow ranges of 0.76x0.82 and 0.83x0.86. While x=0.820 shows A -type antiferromagnetic (A -AF) ordering below 22 K, x=0.833 is confirmed to have a magnetic ground state of A -AF ordering below ∼8K and is only reachable through slow cooling. In addition, x=0.859 is found to be responsible for the highest A -AF transition temperature at about 29 K. Staging model based on ordered stacking of multivacancy layers is proposed to explain the hysteretic behavior and A -AF correlation length for x ∼0.82-0.86.

Original language	English
Article number	014117
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	80
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.80.014117
State	Published - 6 Aug 2009

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title = "Staging model of the ordered stacking of vacancy layers and phase separation in layered Nax CoO2 (x0.71) single crystals",

abstract = "Phase diagram of Nax CoO2 (x0.71) has been reinvestigated using electrochemically fine-tuned single crystals. Both phase-separation and staging phenomena as a result of sodium multivacancy cluster ordering have been found. Phase-separation phenomenon is observed in the narrow ranges of 0.76x0.82 and 0.83x0.86. While x=0.820 shows A -type antiferromagnetic (A -AF) ordering below 22 K, x=0.833 is confirmed to have a magnetic ground state of A -AF ordering below ∼8K and is only reachable through slow cooling. In addition, x=0.859 is found to be responsible for the highest A -AF transition temperature at about 29 K. Staging model based on ordered stacking of multivacancy layers is proposed to explain the hysteretic behavior and A -AF correlation length for x ∼0.82-0.86.",

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T1 - Staging model of the ordered stacking of vacancy layers and phase separation in layered Nax CoO2 (x0.71) single crystals

AU - Shu, G. J.

AU - Huang, F. T.

AU - Chu, M. W.

AU - Lin, Jiunn-Yuan

AU - Lee, Patrick A.

AU - Chou, F. C.

PY - 2009/8/6

Y1 - 2009/8/6

N2 - Phase diagram of Nax CoO2 (x0.71) has been reinvestigated using electrochemically fine-tuned single crystals. Both phase-separation and staging phenomena as a result of sodium multivacancy cluster ordering have been found. Phase-separation phenomenon is observed in the narrow ranges of 0.76x0.82 and 0.83x0.86. While x=0.820 shows A -type antiferromagnetic (A -AF) ordering below 22 K, x=0.833 is confirmed to have a magnetic ground state of A -AF ordering below ∼8K and is only reachable through slow cooling. In addition, x=0.859 is found to be responsible for the highest A -AF transition temperature at about 29 K. Staging model based on ordered stacking of multivacancy layers is proposed to explain the hysteretic behavior and A -AF correlation length for x ∼0.82-0.86.

AB - Phase diagram of Nax CoO2 (x0.71) has been reinvestigated using electrochemically fine-tuned single crystals. Both phase-separation and staging phenomena as a result of sodium multivacancy cluster ordering have been found. Phase-separation phenomenon is observed in the narrow ranges of 0.76x0.82 and 0.83x0.86. While x=0.820 shows A -type antiferromagnetic (A -AF) ordering below 22 K, x=0.833 is confirmed to have a magnetic ground state of A -AF ordering below ∼8K and is only reachable through slow cooling. In addition, x=0.859 is found to be responsible for the highest A -AF transition temperature at about 29 K. Staging model based on ordered stacking of multivacancy layers is proposed to explain the hysteretic behavior and A -AF correlation length for x ∼0.82-0.86.

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Staging model of the ordered stacking of vacancy layers and phase separation in layered Nax CoO2 (x0.71) single crystals

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