期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 161, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2021.110447
关键词
Half-Heusler compounds; Thin films; Magnetron sputtering; STEM; Electrical properties
资金
- ESF [CZ.02.2.69/0.0/0.0/17_050/0008462]
- MEYS CR [LM2018110]
- CEITEC 2020 [LQ1601]
The study successfully synthesized thin films of half-Heusler compound YPdBi and characterized them using techniques like XRD, XPS, SEM, and STEM, showing that different deposition temperatures affect the film's lattice, strain, and stoichiometry, with a noticeable impact on superconducting properties.
The electrical, optical, and magnetic properties of half-Heusler compounds make them novel interesting materials being studied by many groups worldwide. The synthesis of YPdBi, a member of half-Heusler compounds, thin films have been achieved at different deposition temperatures such as 360 degrees C and 470 degrees C by employing magnetron co-sputtering technique. X-ray diffraction (XRD) examinations have revealed that the film deposited at 360 degrees C has a slightly larger lattice parameter, 6.82 angstrom, than the film fabricated at 470 degrees C, having 6.73 angstrom. The induced strain of the films has been 2.1% and 0.7% for the films deposited at 360 degrees C and 470 degrees C, respectively. Xray photoelectron spectroscopy (XPS) investigations have revealed the obtained films have the stoichiometry close to the 1:1:1 ratio. Scanning electron microscopy (SEM) studies have shown that surface topography varies dramatically as the deposition temperature advances. Furthermore, high-resolution scanning transmission electron microscopy (STEM) has shown that layer-plus-island growth known as the Stranski-Krastanov (SK) growth mode, taking place due to minimization of strain energy, leads to the island formation from a specific film thickness on. It has been shown that while the resistance of the sample grown at 470 degrees C changes abruptly at 2.45 K, which indicates the onset of superconductivity, the sample deposited at 360 degrees C does not show this effect. The absence of the onset of superconductivity in this latter case might be associated with the lattice strain and intensive scattering in this sample.
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