Raman phonons and ageing-related surface disorder in NaxCoO 2

M. N. Iliev; A. P. Litvinchuk; R. L. Meng; Y. Y. Sun; J. Cmaidalka; C. W. Chu

doi:10.1016/j.physc.2003.09.085

Raman phonons and ageing-related surface disorder in Na_xCoO ₂

M. N. Iliev, A. P. Litvinchuk, R. L. Meng, Y. Y. Sun, J. Cmaidalka, C. W. Chu

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Abstract

The polarized Raman spectra from ab and ac surfaces of single crystal Na_xCoO₂ (x≈0.7), parent compound of recently discovered superconductor Na_xCoO₂·yH₂O, are reported and discussed. The crystals were hexagon platelets of typical size 3×3×0.1 mm. Three of the five (A_1g+E_1g+3E _2g) Raman active phonons were unambiguously identified at 458 (E _1g), 494 (E_2g) and 574 (A_1g) cm^-1. The spectra from ab and ac surfaces differ significantly and provide evidence that within hours after preparation the ac surface, unlike the ab one, is strongly disordered. Within several days the disorder extends over the ab surface too.

Original language	English
Pages (from-to)	239-242
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	402
Issue number	3
DOIs	https://doi.org/10.1016/j.physc.2003.09.085
Publication status	Published - 2004 Feb 15

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2003.09.085

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title = "Raman phonons and ageing-related surface disorder in NaxCoO 2",

abstract = "The polarized Raman spectra from ab and ac surfaces of single crystal NaxCoO2 (x≈0.7), parent compound of recently discovered superconductor NaxCoO2·yH2O, are reported and discussed. The crystals were hexagon platelets of typical size 3×3×0.1 mm. Three of the five (A1g+E1g+3E 2g) Raman active phonons were unambiguously identified at 458 (E 1g), 494 (E2g) and 574 (A1g) cm-1. The spectra from ab and ac surfaces differ significantly and provide evidence that within hours after preparation the ac surface, unlike the ab one, is strongly disordered. Within several days the disorder extends over the ab surface too.",

author = "Iliev, {M. N.} and Litvinchuk, {A. P.} and Meng, {R. L.} and Sun, {Y. Y.} and J. Cmaidalka and Chu, {C. W.}",

note = "Funding Information: This work was supported in part by the State of Texas through the Texas Center for Superconductivity and Advanced Materials, NSF Grant No. DMR-9804325, and the Division of Materials Sciences of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.",

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AU - Iliev, M. N.

AU - Litvinchuk, A. P.

AU - Meng, R. L.

AU - Sun, Y. Y.

AU - Cmaidalka, J.

AU - Chu, C. W.

N1 - Funding Information: This work was supported in part by the State of Texas through the Texas Center for Superconductivity and Advanced Materials, NSF Grant No. DMR-9804325, and the Division of Materials Sciences of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.

PY - 2004/2/15

Y1 - 2004/2/15

N2 - The polarized Raman spectra from ab and ac surfaces of single crystal NaxCoO2 (x≈0.7), parent compound of recently discovered superconductor NaxCoO2·yH2O, are reported and discussed. The crystals were hexagon platelets of typical size 3×3×0.1 mm. Three of the five (A1g+E1g+3E 2g) Raman active phonons were unambiguously identified at 458 (E 1g), 494 (E2g) and 574 (A1g) cm-1. The spectra from ab and ac surfaces differ significantly and provide evidence that within hours after preparation the ac surface, unlike the ab one, is strongly disordered. Within several days the disorder extends over the ab surface too.

AB - The polarized Raman spectra from ab and ac surfaces of single crystal NaxCoO2 (x≈0.7), parent compound of recently discovered superconductor NaxCoO2·yH2O, are reported and discussed. The crystals were hexagon platelets of typical size 3×3×0.1 mm. Three of the five (A1g+E1g+3E 2g) Raman active phonons were unambiguously identified at 458 (E 1g), 494 (E2g) and 574 (A1g) cm-1. The spectra from ab and ac surfaces differ significantly and provide evidence that within hours after preparation the ac surface, unlike the ab one, is strongly disordered. Within several days the disorder extends over the ab surface too.

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JO - Physica C: Superconductivity and its applications

JF - Physica C: Superconductivity and its applications

IS - 3

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Raman phonons and ageing-related surface disorder in Na_xCoO ₂

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