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Research Article| October 20 2005

Structural and transport properties of epitaxial ${Na}_{x} Co O_{2}$ thin films

A. Venimadhav;

A. Venimadhav

Department of Physics,

The Pennsylvania State University

, University Park, Pennsylvania 16802

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A. Soukiassian;

A. Soukiassian

Department of Materials Science and Engineering,

The Pennsylvania State University

, University Park, Pennsylvania 16802

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D. A. Tenne;

D. A. Tenne

Department of Physics,

The Pennsylvania State University

, University Park, Pennsylvania 16802

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Qi Li;

Qi Li ^a)

Department of Physics,

The Pennsylvania State University

, University Park, Pennsylvania 16802

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X. X. Xi;

X. X. Xi

Department of Physics and Department of Materials Science and Engineering,

The Pennsylvania State University

, University Park, Pennsylvania 16802

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D. G. Schlom;

D. G. Schlom

Department of Materials Science and Engineering,

The Pennsylvania State University

, University Park, Pennsylvania 16802

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R. Arroyave;

R. Arroyave

Department of Materials Science and Engineering,

The Pennsylvania State University

, University Park, Pennsylvania 16802

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Z. K. Liu;

Z. K. Liu

Department of Materials Science and Engineering,

The Pennsylvania State University

, University Park, Pennsylvania 16802

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H. P. Sun;

H. P. Sun

Department of Materials Science and Engineering,

The University of Michigan

, Ann Arbor, Michigan 48109

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Xiaoqing Pan;

Xiaoqing Pan

Department of Materials Science and Engineering,

The University of Michigan

, Ann Arbor, Michigan 48109

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Minhyea Lee;

Minhyea Lee

Department of Physics,

Princeton University

, New Jersey 08544

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N. P. Ong

N. P. Ong

Department of Physics,

Princeton University

, New Jersey 08544

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Author & Article Information

Electronic mail: [email protected]

Appl. Phys. Lett. 87, 172104 (2005)

https://doi.org/10.1063/1.2117619

We have studied structural and transport properties of epitaxial ${Na}_{x} Co O_{2}$ thin films on (0001) sapphire substrate prepared by topotaxially converting an epitaxial ${Co}_{3} O_{4}$ film to ${Na}_{x} Co O_{2}$ with annealing in Na vapor. The films are $c$ -axis oriented and in-plane aligned with $[10 \bar{1} 0] {Na}_{x} Co O_{2}$ rotated by 30° from $[10 \bar{1} 0]$ sapphire. Different Na vapor pressures during the annealing resulted in films with different Na concentrations, which showed distinct transport properties.

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© 2005 American Institute of Physics.

2005

American Institute of Physics

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