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Origin of the Spin DensityWave Instability in AFe2As2 (A = Ba, Sr) as Revealed by Optical Spectroscopy



Hao Hu,1,2 H. J Gao,1 and Feng Liu2,*
1Institute of Physics, Chinese Academy of Science, Beijing 100190, China
2Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA
(Received 23 April 2008; published 20 November 2008)


We develop a theoretical model to elucidate the nucleation of strained islands on patterned substrates. We show that island nucleation is directed to the preferred sites by a much lower energy barrier and smaller critical size. Strain relaxation directs island nucleation to the bottom of a pit rather than the top of a ridge as commonly perceived, while large surface energy anisotropy favors nucleation at both places. The theory explains some puzzling experimental results and provides useful guidelines for future experiments.

DOI: 10.1103/PhysRevLett.101.216102         PACS PACS numbers: 68.35.Gy, 68.35.Md, 81.10.Aj




For Details

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