首页|Cryogenic Digital Image Correlation as a Probe of Strain in Iron-Based Superconductors
Cryogenic Digital Image Correlation as a Probe of Strain in Iron-Based Superconductors
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Uniaxial strain is a powerful tuning parameter that can control symmetry and anisotropic electronic properties in iron-based superconductors.However,accurately characterizing anisotropic strain can be challenging and complex.Here,we utilize a cryogenic optical system equipped with a high-spatial-resolution microscope to characterize surface strains in iron-based superconductors using the digital image correlation method.Compared with other methods such as high-resolution x-ray diffraction,strain gauge,and capacitive sensor,digital image correlation offers a non-contact full-field measurement approach,acting as an optical virtual strain gauge that provides high spatial resolution.The results measured on detwinned BaFe2As2 are quantitatively consistent with the distortion measured by x-ray diffraction and neutron Larmor diffraction.These findings highlight the potential of cryogenic digital image correlation as an effective and accessible tool for probing the isotropic and anisotropic strains,facilitating applications of uniaxial strain tuning in research of quantum materials.
莫子夜、李春熠、张文婷、刘畅、孙永欣、刘瑞鲜、鲁兴业
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Center for Advanced Quantum Studies,School of Physics and Astronomy,Beijing Normal University,Beijing 100875,China
National Key Research and Development Program of ChinaFundamental Research Funds for the Central UniversitiesNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
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