Growth and characterization of Nb films and Nb/Al-AlO&lt;inf&gt;x&lt;/inf&gt;/Nb trilayers for Josephson junctions

Kang, Xinjie; Ying, Liliang; Wang, Huiwu; Kong, Xiangyan; Peng, Wei; Xie, Xiaoming

doi:10.1109/isec.2013.6604315

Cited by 1 publication

(1 citation statement)

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“…Sputter-deposited columnar thin films have been shown to have small variations in grain orientation from the mean value [48,49]. Here, a maximum grain misorientation of q D =  2.5 is assumed such that each grain is randomly assigned a value between   1.25 from the mean direction.…”

Section: Grain Boundary Barriermentioning

confidence: 99%

Temperature-dependent plastic hysteresis in highly confined polycrystalline Nb films

Waheed¹,

Hao²,

Zheng³

et al. 2018

Modelling Simul. Mater. Sci. Eng.

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In this study, the effect of temperature on the cyclic deformation behaviour of a confined polycrystalline Nb film is investigated. Micropillars encapsulating a thin niobium interlayer are deformed under cyclic axial compression at different test temperatures. A distinct plastic hysteresis is observed for samples tested at elevated temperatures, whereas negligible plastic hysteresis is observed for samples tested at room temperature. These results are interpreted using planar discrete dislocation plasticity incorporating slip transmission across grain boundaries. The effect of temperature-dependent grain boundary energy and dislocation mobility on dislocation penetration and, consequently, the size of plastic hysteresis is simulated to correlate with the experimental results. It is found that the decrease in grain boundary energy barrier caused by the increase in temperature does not lead to any appreciable change in the cyclic response. However, dislocation mobility significantly affects the size of plastic hysteresis, with high mobilities leading to a larger hysteresis. Therefore, it is postulated that the experimental observations are predominantly caused by an increase in dislocation mobility as the temperature is increased above the critical temperature of body-centred cubic niobium.

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Section: Grain Boundary Barriermentioning

confidence: 99%