Molecular beam epitaxy growth and surface structure of Sr1−xNdxCuO2 cuprate films
Jia-Qi Fan, Shu-Ze Wang, Xue-Qing Yu, Rui-Feng Wang, Yan-Ling Xiong, Can-Li Song, Xu-Cun Ma, Qi-Kun Xue
DOI 10.1103/PhysRevB.101.180508 · Physical Review B
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Abstract
We report on the epitaxial growth and surface structure of infinite-layer cuprate Sr1−xNdxCuO2 films on SrTiO3(001) substrates by combining ozone-assisted molecular beam epitaxy and in situ scanning tunneling microscopy. Careful substrate temperature and flux control has been used to achieve single-phase, stoichiometric, and c-axis oriented films. The surface of the films is usually characterized by a mixed CuO2 surface and gridlike superstructure. The superstructure exhibits a periodicity of 3.47 nm that corresponds to a coincidence lattice between the overlayer peroxide SrO2 and underlying CuO2 plane, and gives rise to a conductance spectrum that is distinct from the Mott-Hubbard band structure of CuO2. At a higher Nd composition x>0.1, a (2×2) surface characteristic of the hole-doped CuO2 emerges, which we ascribe to the intake of apical oxygens in the intervening Sr planes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr1-xNdxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
| Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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