Many-body electronic structure in pyrochlore superconductor CsBi2 and spin liquid Pr2Ir2O7
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917162116972544 |
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| author | Song, Wei Liu, Guowei Deng, Hanbin Yang, Tianyu Li, Yongkai Yan, Xiao-Yu Liao, Ruoxing Wang, Qianming Xu, Jiayu Yan, Chao Zhao, Yuanyuan Qin, Hailang Wang, Da Jing, Wenchuan Shen, Dawei Nakayama, Kosuke Sato, Takafumi Setty, Chandan Wu, Desheng Song, Boqing Ying, Tianping Tian, Zhaoming Sakai, Akito Nakatsuji, Satoru Kumar, Harish Kuntscher, Christine A. Wang, Zhiwei Xue, Qi-Kun Yin, Jia-Xin |
| author_facet | Song, Wei Liu, Guowei Deng, Hanbin Yang, Tianyu Li, Yongkai Yan, Xiao-Yu Liao, Ruoxing Wang, Qianming Xu, Jiayu Yan, Chao Zhao, Yuanyuan Qin, Hailang Wang, Da Jing, Wenchuan Shen, Dawei Nakayama, Kosuke Sato, Takafumi Setty, Chandan Wu, Desheng Song, Boqing Ying, Tianping Tian, Zhaoming Sakai, Akito Nakatsuji, Satoru Kumar, Harish Kuntscher, Christine A. Wang, Zhiwei Xue, Qi-Kun Yin, Jia-Xin |
| contents | The pyrochlore lattice materials can exhibit geometrical frustration, while the related many-body electronic states remain elusive. In this work, we performed scanning tunneling microscopy measurements on the pyrochlore superconductor CsBi2 and spin liquid Pr2Ir2O7 at 0.3 K. For the first time, we obtained atomically resolved images of their (111) surfaces, revealing a hexagonal lattice or a kagome lattice. Tunneling spectroscopy in CsBi2 reveals a nearly fully opened superconductivity gap. The ratio of 2Δ/kBTC = 4.7 suggests relatively strong coupling superconductivity, as compared with that in kagome superconductors AV3Sb5 (A = K, Rb, Cs). In contrast to the previous study categorizing CsBi2 as a type-I superconductor, the applied magnetic field induces a hexagonal vortex lattice in which each vortex core exhibits an intriguing three-fold symmetry state. In Pr2Ir2O7, we observed a spatially homogeneous Kondo-lattice resonance, which is compared with that in the kagome Kondo-lattice material CsCr6Sb6. We further discover that the Kondo resonance exhibits a spatial modulation with three-fold symmetry, and the applied magnetic field induces a Zeeman splitting of the Kondo resonance with intriguing atomic site dependence. We discuss the relations of these many-body electronic phenomena with the pyrochlore lattice geometry and its charge or spin frustration. Our systematic observations offer atomic-scale insights into the many-body electronic structures of the geometrically frustrated pyrochlore superconductors and spin liquids. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_18059 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Many-body electronic structure in pyrochlore superconductor CsBi2 and spin liquid Pr2Ir2O7 Song, Wei Liu, Guowei Deng, Hanbin Yang, Tianyu Li, Yongkai Yan, Xiao-Yu Liao, Ruoxing Wang, Qianming Xu, Jiayu Yan, Chao Zhao, Yuanyuan Qin, Hailang Wang, Da Jing, Wenchuan Shen, Dawei Nakayama, Kosuke Sato, Takafumi Setty, Chandan Wu, Desheng Song, Boqing Ying, Tianping Tian, Zhaoming Sakai, Akito Nakatsuji, Satoru Kumar, Harish Kuntscher, Christine A. Wang, Zhiwei Xue, Qi-Kun Yin, Jia-Xin Strongly Correlated Electrons Superconductivity The pyrochlore lattice materials can exhibit geometrical frustration, while the related many-body electronic states remain elusive. In this work, we performed scanning tunneling microscopy measurements on the pyrochlore superconductor CsBi2 and spin liquid Pr2Ir2O7 at 0.3 K. For the first time, we obtained atomically resolved images of their (111) surfaces, revealing a hexagonal lattice or a kagome lattice. Tunneling spectroscopy in CsBi2 reveals a nearly fully opened superconductivity gap. The ratio of 2Δ/kBTC = 4.7 suggests relatively strong coupling superconductivity, as compared with that in kagome superconductors AV3Sb5 (A = K, Rb, Cs). In contrast to the previous study categorizing CsBi2 as a type-I superconductor, the applied magnetic field induces a hexagonal vortex lattice in which each vortex core exhibits an intriguing three-fold symmetry state. In Pr2Ir2O7, we observed a spatially homogeneous Kondo-lattice resonance, which is compared with that in the kagome Kondo-lattice material CsCr6Sb6. We further discover that the Kondo resonance exhibits a spatial modulation with three-fold symmetry, and the applied magnetic field induces a Zeeman splitting of the Kondo resonance with intriguing atomic site dependence. We discuss the relations of these many-body electronic phenomena with the pyrochlore lattice geometry and its charge or spin frustration. Our systematic observations offer atomic-scale insights into the many-body electronic structures of the geometrically frustrated pyrochlore superconductors and spin liquids. |
| title | Many-body electronic structure in pyrochlore superconductor CsBi2 and spin liquid Pr2Ir2O7 |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2511.18059 |