Ultrasound evidence for multicomponent superconducting order parameter in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ with electron quadrupling phase Article Swipe

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Chris Halcrow , Ilya Shipulin , Federico Caglieris , Yongwei Li , Kunihiro Kihou , Chul‐Ho Lee , H.‐H. Klauß , S. Zherlitsyn , Vadim Grinenko , Egor Babaev ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2404.03020

Experiments have pointed to the formation of the electron quadrupling condensate in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ at $x \sim 0.8$. The state spontaneously breaks time-reversal symmetry and is sandwiched between two critical points, separating it from the broken time-reversal symmetry (BTRS) superconducting state at $T_{\rm c}^{U(1)}$ and normal-metal state at $T_{\rm c}^{\rm Z2}$. We report a theory of the acoustic effects spectroscopy of systems with an electron quadrupling phase based on ultrasound-velocity measurements. We show that the experimental results are consistent with BTRS superconductivity at $x \sim 0.8$, fulfilling the necessary condition for the formation of electron quadrupling in Ba$_{1-x}$K$_x$Fe$_2$As$_2$. We provide the theoretical basis and the experimental strategy to study the order parameter symmetry of emerging quadrupling condensates in superconductors.

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2404.03020
PDF: https://arxiv.org/pdf/2404.03020
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DOI: https://doi.org/10.48550/arxiv.2404.03020

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Title: Ultrasound evidence for multicomponent superconducting order parameter in Ba$_{1-x}$K$_x$Fe$_2$As$_2$ with electron quadrupling phase

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Publication year: 2024

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Authors: Chris Halcrow, Ilya Shipulin, Federico Caglieris, Yongwei Li, Kunihiro Kihou, Chul‐Ho Lee, H.‐H. Klauß, S. Zherlitsyn, Vadim Grinenko, Egor Babaev

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Concepts: Order (exchange), Physics, Optics, Economics, Finance

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