研究目的
To synthesize heavy fermion CeCoIn5 thin film via pulsed laser deposition and investigate its superconducting properties.
研究成果
The study successfully synthesized thin films of CeCoIn5 on c-cut Al2O3 substrates using PLD. The films showed a zero-resistance superconducting transition at 1.8 K and a Kondo coherence peak at 49 K. The temperature dependence of the upper critical field was in good agreement with that of high-quality single crystals. Further optimization of growth conditions is needed to produce high-quality epitaxial thin films without secondary phases.
研究不足
The growth of Co115 thin films depends on deposition conditions such as laser fluence, deposition temperature, and ambient pressure in the PLD. The deposition window required for obtaining Co115 layers is narrow, making it difficult to grow high-quality epitaxial thin films without secondary phases.
1：Experimental Design and Method Selection:
The study used pulsed laser deposition (PLD) to grow CeCoIn5 thin films on Al2O3 (0001) substrates. The films were characterized using X-ray diffraction (XRD), Field Emission-Scanning Electron Microscopy (FE-SEM), and energy dispersive X-ray spectroscopy (EDX). Electrical resistivity measurements were conducted using a standard four-probe method.
2：Sample Selection and Data Sources:
Polycrystal Co115 targets were prepared by the arc melting method using stoichiometric elemental metals.
3：List of Experimental Equipment and Materials:
A LightMachinery IPEX-864 excimer laser was used for ablation. The substrates were heated using a halogen lamp heater.
4：Experimental Procedures and Operational Workflow:
The deposition temperature was 600 °C, with a total of 36,000 laser shots at a repetition rate of 10 Hz.
5：Data Analysis Methods:
The XRD data were refined using the FullProf program. Electrical resistivity was measured under magnetic fields up to 9 T.
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