| Issue |
EPL
Volume 153, Number 6, March 2026
|
|
|---|---|---|
| Article Number | 66003 | |
| Number of page(s) | 7 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/ae4fec | |
| Published online | 26 March 2026 | |
Optical determination of the thickness of 2D flakes of the superconductor β-FeSe
Instituto Balseiro (UNCuyo-CNEA) - Av. Exequiel Bustillo 9500, San Carlos de Bariloche, Argentina and Instituto de Nanociencia y Nanotecnología (CNEA-CONICET) - Av. Exequiel Bustillo 9500, San Carlos de Bariloche, Argentina
Received: 7 October 2025
Accepted: 10 March 2026
Abstract
We present optical contrast measurements under a controlled atmosphere on samples of FeSe with thicknesses ranging from 5 to 300 nm. The results are described using optical interference models that allow to obtain the material's refractive index as a function of wavelength. The calculated optical contrast maps have shown to be sensitive for thinner flakes under small variations of the complex refractive index. Also from these kind of maps we show that it is possible to monitor sample degradation using optical contrast measurements.
© 2026 EPLA
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