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arXiv · 1910.02221

Elastic properties of few unit cell thick superconducting crystals of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$

Sudhir Kumar Sahu·Digambar Jangade·Arumugam Thamizhavel·Mandar M. Deshmukh·Vibhor Singh
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Abstract

We present systematic measurements of the mechanical properties of few unit cell (UC) thick exfoliated crystals of a high-T$_c$ cuprate superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$. We determine the elastic properties of these crystals by deformation using an atomic force microscope (AFM) at room temperature. With the spatial measurements of local compliance and their detailed modeling, we independently determine the Young's modulus of rigidity and the pre-stress. The Young's modulus of rigidity is found to be in the range of 22 GPa to 30 GPa for flakes with thickness from 5 UC to 18 UC. The pre-stress spreads over the range of 5 MPa - 46 MPa, indicating a run-to-run variation during the exfoliation process. The determination of Young's modulus of rigidity for thin flakes is further verified from recently reported buckling technique.

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Sudhir Kumar Sahu, Digambar Jangade, Arumugam Thamizhavel, Mandar M. Deshmukh, Vibhor Singh. 2019-10-05. Elastic properties of few unit cell thick superconducting crystals of Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$. https://doi.org/10.1063/1.5121490

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