Fabrication of microstructured devices of the unconventional superconductor CeCoIn5 for investigations of isolated grain boundaries
S. Mishra, S. M. Thomas, R. McCabe, E. D. Bauer, F. Ronning
DOI 10.1103/26bh-wm4q · Physical Review Materials
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Abstract
Grain boundaries are critical for determining the functionality of polycrystalline materials. Here we investigate and present the structural and transport properties of grain boundaries in the unconventional superconductor CeCoIn5. We provide a detailed recipe for the fabrication of isolated grain-boundary devices from as-grown polycrystalline samples of CeCoIn5. Electron backscattered diffraction imaging of polycrystalline CeCoIn5 samples reveals an abundance of 90∘ misorientation grain boundaries, suggesting a preferential nucleation of CeCoIn5 grains with 90∘ misorientation over a random distribution of grain orientations. Transport measurements across grain-boundary devices establish coherence of superconductivity and allow us to establish a lower bound on the critical current density for the grain boundaries. Our work opens possibilities for fabrication of quantum devices such as Josephson junctions out of bulk unconventional superconducting materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | unknown |
| Ce2CoIn8 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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