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Journal Articles Journal of Materials Research Year : 2022

Atomic scale microstructural insights of superconducting β-tungsten thin films

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Abstract

The importance of atomic structure to understand the superconducting β-Tungsten (W) thin films especially their critical transition temperature (Tc) and upper critical magnetic field Hc2(0) is reported. Here, Tc and Hc2(0) for a low thickness (~ 35 nm) film are found to be ~ 3.14 K and 10.72 T, whereas for a comparatively thicker (~ 60 nm) film, these are 1.38 K and 2.34 T, respectively. The β-phase is identified by grazing-incidence X-ray diffraction. The microstructure is probed by transmission electron microscopy, where high-resolution images manifest an improvement in crystallinity of the nanoscale grains in a disordered matrix with increasing film thickness. A drastic change in atomic structure corresponding to two different thicknesses is found to be associated with the change in oxygen concentration. Particularly, the existence of amorphous-W in the presence of β-W is revealed in 35 nm film, which is further supported by ab-initio calculations. Based on the atomic and microstructure, superconducting properties of the β-W films are analyzed and discussed.
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hal-03853337 , version 1 (15-11-2022)

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Ananya Chattaraj, Manju Mishra Patidar, V. Ganesan, Sébastien Joulie, Virginie Serin, et al.. Atomic scale microstructural insights of superconducting β-tungsten thin films. Journal of Materials Research, 2022, ⟨10.1557/s43578-022-00803-y⟩. ⟨hal-03853337⟩
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