| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Cryogenic Digital Image Correlation as a Probe of Strain in Iron-Based Superconductors |
| Ziye Mo, Chunyi Li, Wenting Zhang, Chang Liu, Yongxin Sun, Ruixian Liu, and Xingye Lu* |
| Center for Advanced Quantum Studies, School of Physics and Astronomy, Beijing Normal University, Beijing 100875, China |
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| Cite this article: |
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Ziye Mo, Chunyi Li, Wenting Zhang et al 2024 Chin. Phys. Lett. 41 107102 |
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Abstract 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 BaFe$_2$As$_2$ 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.
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Received: 18 August 2024
Published: 18 October 2024
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| PACS: |
71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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71.45.Lr
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(Charge-density-wave systems)
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71.10.Pm
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(Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.))
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74.25.-q
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(Properties of superconductors)
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