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01731 am a22002653u 4500 |
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51049 |
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|a Shu, G. J.
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|a Massachusetts Institute of Technology. Department of Physics
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|a Lee, Patrick A.
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|a Lee, Patrick A.
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|a Huang, F.-T.
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|a Chu, M.-W.
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|a Lin, J.-Y
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|a Lee, Patrick A.
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|a Chou, F. C.
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|a Staging model of the ordered stacking of vacancy layers and phase separation in layered NaxCoO2 (x≳0.71) single crystals
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|b American Physical Society,
|c 2010-01-29T20:20:06Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/51049
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|a Phase diagram of Na[subscript x]CoO[subscript 2](x≳0.71) 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 0.76≲x≲0.82 and 0.83≲x≲0.86. 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 ∼8 K 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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|a Department of Energy
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|a National Science Council of Taiwan
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|a en_US
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|a Article
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|t Physical Review B
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