Growth of DyBa2Cu3O7-x studied by scanning tunneling microscopy

N. Chandrasekhar; V. Agrawal; V. S. Achutharaman; A. M. Goldman

doi:10.1063/1.106993

Growth of DyBa₂Cu₃O_7-x studied by scanning tunneling microscopy

N. Chandrasekhar, V. Agrawal, V. S. Achutharaman, A. M. Goldman

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Abstract

Scanning tunneling microscopy (STM) has been used to investigate the microstructure of DyBa₂Cu₃O_7-x films grown on (100) SrTiO₃ by ozone-assisted molecular beam epitaxy. The surface roughness is found to be higher than that reported for sputtered films of YBa₂Cu₃O_7-x. Intensity oscillations were observed in the specular spot of in situ reflection high energy electron diffraction patterns, a result which suggests that surface smoothness is not a requisite for the observation of such intensity oscillations. The observation of spiral morphology in STM pictures indicates the presence of screw dislocations, in excess of 10⁹ cm^-2. A zeroth order approximation has been used to evaluate the shapes of the spirals and reasonable agreement is obtained with experiment.

Original language	English (US)
Pages (from-to)	2424-2426
Number of pages	3
Journal	Applied Physics Letters
Volume	60
Issue number	19
DOIs	https://doi.org/10.1063/1.106993
State	Published - 1992
Externally published	Yes

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abstract = "Scanning tunneling microscopy (STM) has been used to investigate the microstructure of DyBa2Cu3O7-x films grown on (100) SrTiO3 by ozone-assisted molecular beam epitaxy. The surface roughness is found to be higher than that reported for sputtered films of YBa2Cu3O7-x. Intensity oscillations were observed in the specular spot of in situ reflection high energy electron diffraction patterns, a result which suggests that surface smoothness is not a requisite for the observation of such intensity oscillations. The observation of spiral morphology in STM pictures indicates the presence of screw dislocations, in excess of 109 cm-2. A zeroth order approximation has been used to evaluate the shapes of the spirals and reasonable agreement is obtained with experiment.",

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AU - Chandrasekhar, N.

AU - Agrawal, V.

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AU - Goldman, A. M.

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AB - Scanning tunneling microscopy (STM) has been used to investigate the microstructure of DyBa2Cu3O7-x films grown on (100) SrTiO3 by ozone-assisted molecular beam epitaxy. The surface roughness is found to be higher than that reported for sputtered films of YBa2Cu3O7-x. Intensity oscillations were observed in the specular spot of in situ reflection high energy electron diffraction patterns, a result which suggests that surface smoothness is not a requisite for the observation of such intensity oscillations. The observation of spiral morphology in STM pictures indicates the presence of screw dislocations, in excess of 109 cm-2. A zeroth order approximation has been used to evaluate the shapes of the spirals and reasonable agreement is obtained with experiment.

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Growth of DyBa₂Cu₃O_7-x studied by scanning tunneling microscopy

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