Microwave Signature of the Emerging Abrikosov Lattice Above $H_{c2}$
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| Format: | Preprint |
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2025
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| _version_ | 1866914190004846592 |
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| author | Zhou, Hang Chen, Zhanghai Varlamov, A. A. Glatz, Andreas Yerin, Yuriy |
| author_facet | Zhou, Hang Chen, Zhanghai Varlamov, A. A. Glatz, Andreas Yerin, Yuriy |
| contents | The emergence of the Abrikosov lattice in the normal phase of type-II superconducting films when the magnetic field approaches the critical field $H_{c2}$ from above was predicted in Ref.~\cite{GVV2011}. In the quantum fluctuation regime \cite{GL2001} it is characterized by the formation of relatively large (with sizes of order $ξ_{\mathrm{QF}} \sim ξ_{\mathrm{BCS}}\sqrt{H_{c2}/(H-H_{c2})}$) ``long lived'' (lifetime of order $τ_{\mathrm{QF}} \sim \hbar Δ^{-1} H_{c2}/(H-H_{c2})$) clusters of rotating fluctuation Cooper pairs - signatures of developing Abrikosov vortices. We demonstrate that these fluctuation-induced vortex clusters, previously considered unobservable due to their ultrafast dynamics and weak (only logarithmically singular) contribution to the dc-conductivity, can in fact be detected through their distinct electromagnetic signature. By analyzing the high-frequency electromagnetic response of these rotating fluctuation Cooper pairs above the second critical field in superconducting film, we predict a pronounced and measurable enhancement in the imaginary part of the ac-conductivity arising directly from quantum fluctuations. This enhancement is expected to occur at characteristic frequencies $ω_{QF} \sim \hbar^{-1}Δ(H-H_{c2})/H_{c2}$, which are well below the superconducting threshold at $2\hbar^{-1}Δ$, where a similar increase in imaginary conductivity occurs in the superconducting phase. For niobium, a prototypical type II superconductor, $ω_{QF}$ lies in the experimentally accessible microwave range, making the effect directly testable with modern microwave spectroscopy. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_08586 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Microwave Signature of the Emerging Abrikosov Lattice Above $H_{c2}$ Zhou, Hang Chen, Zhanghai Varlamov, A. A. Glatz, Andreas Yerin, Yuriy Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons The emergence of the Abrikosov lattice in the normal phase of type-II superconducting films when the magnetic field approaches the critical field $H_{c2}$ from above was predicted in Ref.~\cite{GVV2011}. In the quantum fluctuation regime \cite{GL2001} it is characterized by the formation of relatively large (with sizes of order $ξ_{\mathrm{QF}} \sim ξ_{\mathrm{BCS}}\sqrt{H_{c2}/(H-H_{c2})}$) ``long lived'' (lifetime of order $τ_{\mathrm{QF}} \sim \hbar Δ^{-1} H_{c2}/(H-H_{c2})$) clusters of rotating fluctuation Cooper pairs - signatures of developing Abrikosov vortices. We demonstrate that these fluctuation-induced vortex clusters, previously considered unobservable due to their ultrafast dynamics and weak (only logarithmically singular) contribution to the dc-conductivity, can in fact be detected through their distinct electromagnetic signature. By analyzing the high-frequency electromagnetic response of these rotating fluctuation Cooper pairs above the second critical field in superconducting film, we predict a pronounced and measurable enhancement in the imaginary part of the ac-conductivity arising directly from quantum fluctuations. This enhancement is expected to occur at characteristic frequencies $ω_{QF} \sim \hbar^{-1}Δ(H-H_{c2})/H_{c2}$, which are well below the superconducting threshold at $2\hbar^{-1}Δ$, where a similar increase in imaginary conductivity occurs in the superconducting phase. For niobium, a prototypical type II superconductor, $ω_{QF}$ lies in the experimentally accessible microwave range, making the effect directly testable with modern microwave spectroscopy. |
| title | Microwave Signature of the Emerging Abrikosov Lattice Above $H_{c2}$ |
| topic | Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.08586 |