ac strain based thermodynamic criterion for vortex lattice in type-II superconductors
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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913138591399936 |
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| author | Lu, Peipei Yuan, Mengju Zhang, Jing Gao, Qiang Liu, Shuang Zhang, Yugang Shen, Shipeng Zhang, Long Lu, Jun Zhou, Xiaoyuan He, Mingquan Wang, Aifeng Li, Yang Hong, Wenshan Li, Shiliang Luo, Huiqian Zhou, Xingjiang Chen, Xianhui Sun, Young Chai, Yisheng |
| author_facet | Lu, Peipei Yuan, Mengju Zhang, Jing Gao, Qiang Liu, Shuang Zhang, Yugang Shen, Shipeng Zhang, Long Lu, Jun Zhou, Xiaoyuan He, Mingquan Wang, Aifeng Li, Yang Hong, Wenshan Li, Shiliang Luo, Huiqian Zhou, Xingjiang Chen, Xianhui Sun, Young Chai, Yisheng |
| contents | In type-I superconductors, zero electrical resistivity and perfect diamagnetism define two fundamental criteria for superconducting behavior. In contrast, type-II superconductors exhibit more complex mixed state physics, where magnetic flux penetrates the material above the lower critical field Hc1 in the form of quantized vortices, each carrying a single flux quantum. These vortices form a two dimensional lattice which persists up to another irreversible field (Hirr) and then melts into a dissipative liquid phase. The vortex lattice is fundamental to the magnetic and electrical properties of type II superconductors, ac strain susceptibility-a thermodynamic criterion-for identifying this phase has remained elusive. Here, we report the discovery of a dynamic magnetostrictive effect, wherein the geometry of the superconductor oscillates only under an applied alternating magnetic field due to the disturbance of the vortex lattice. This effect is detected by a thin piezoelectric transducer, which converts the excited geometric deformation into an in-phase ac voltage. Notably, we find a direct and nearly linear relationship between the signal amplitude and the vortex density in lattice across several representative type-II superconductors. In the vortex liquid phase above Hirr, the signal amplitude rapidly decays to zero near the upper critical field (Hc2), accompanied by a pronounced out-of-phase component due to enhanced dissipation. This dynamic magnetostrictive effect not only reveals an unexplored magnetoelastic property of the vortex lattice but also establishes a fundamental criterion for identifying the type-II superconductors. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_08873 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | ac strain based thermodynamic criterion for vortex lattice in type-II superconductors Lu, Peipei Yuan, Mengju Zhang, Jing Gao, Qiang Liu, Shuang Zhang, Yugang Shen, Shipeng Zhang, Long Lu, Jun Zhou, Xiaoyuan He, Mingquan Wang, Aifeng Li, Yang Hong, Wenshan Li, Shiliang Luo, Huiqian Zhou, Xingjiang Chen, Xianhui Sun, Young Chai, Yisheng Superconductivity Materials Science In type-I superconductors, zero electrical resistivity and perfect diamagnetism define two fundamental criteria for superconducting behavior. In contrast, type-II superconductors exhibit more complex mixed state physics, where magnetic flux penetrates the material above the lower critical field Hc1 in the form of quantized vortices, each carrying a single flux quantum. These vortices form a two dimensional lattice which persists up to another irreversible field (Hirr) and then melts into a dissipative liquid phase. The vortex lattice is fundamental to the magnetic and electrical properties of type II superconductors, ac strain susceptibility-a thermodynamic criterion-for identifying this phase has remained elusive. Here, we report the discovery of a dynamic magnetostrictive effect, wherein the geometry of the superconductor oscillates only under an applied alternating magnetic field due to the disturbance of the vortex lattice. This effect is detected by a thin piezoelectric transducer, which converts the excited geometric deformation into an in-phase ac voltage. Notably, we find a direct and nearly linear relationship between the signal amplitude and the vortex density in lattice across several representative type-II superconductors. In the vortex liquid phase above Hirr, the signal amplitude rapidly decays to zero near the upper critical field (Hc2), accompanied by a pronounced out-of-phase component due to enhanced dissipation. This dynamic magnetostrictive effect not only reveals an unexplored magnetoelastic property of the vortex lattice but also establishes a fundamental criterion for identifying the type-II superconductors. |
| title | ac strain based thermodynamic criterion for vortex lattice in type-II superconductors |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2506.08873 |