Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 81: Superconductivity: Properties and Electronic Structure
TT 81.8: Vortrag
Donnerstag, 3. April 2014, 11:30–11:45, HSZ 201
Electrospun superconducting La1.85Sr0.15CuO4 nanowires and nanoribbons — •XianLin Zeng1, Michael R. Koblischka1, Jennifer S. Atchinson2, Volker Presser2, and Uwe Hartmann1 — 1Institute of Experimental Physics, Saarland University, Campus C 6 3, 66123 Saarbrücken, Germany — 2INM – Institute of New Materials Saarbrücken, Campus D 2 2, 66123 Saarbrücken, Germany
The synthesis of high-temperature superconducting La1.85Sr0.15CuO4 nanostructures via electrospinning and a subsequent calcination in air and oxygen is reported. Nanowire and nanoribbon structures are obtained in the experiments with a maximum Tc,onset of 20 K. According to the morphological characterization via scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the nanowires have average diameters of about 230 nm and the length spans more than 30 µm. The nanowires are polycrystalline with a mean grain size of about 110 nm and 30 nm as determined by TEM and X-ray analysis, respectively. The nanoribbons are about 0.5 to 1 µm wide but show a thickness of only 60 to 80 nm, which indicates that the ribbons have a monolayer crystal structure. A confirmation of the chemical phase and component ratio is given by X-ray diffraction and EDX measurements. Attempts are made to achieve a detailed understanding of the formation of nanowires and -ribbons. Furthermore, additional information concerning the symmetry breaking of two phonon modes is obtained via Raman spectra of the nanowires, confirming the previous results presented in [1].
J. M. Li, X. L. Zeng, et al., Cryst. Eng. Comm. 13, 6964 (2011)