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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.22362 |
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| _version_ | 1866909712136536064 |
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| author | Lin, Yi-Qiang Liu, Chang-Chao Li, Jia-Xin Lv, Bai-Jiang Ye, Kai-Xin Zhang, Jia-Wen Wu, Si-Qi Zhang, Ya-Nan Chen, Ye Lu, Jia-Yi Li, Jing Li, Hua-Xun Li, Hao Liu, Yi Wang, Cao Sun, Yun-Lei Jiang, Hao Yuan, Hui-Qiu Cao, Guang-Han |
| author_facet | Lin, Yi-Qiang Liu, Chang-Chao Li, Jia-Xin Lv, Bai-Jiang Ye, Kai-Xin Zhang, Jia-Wen Wu, Si-Qi Zhang, Ya-Nan Chen, Ye Lu, Jia-Yi Li, Jing Li, Hua-Xun Li, Hao Liu, Yi Wang, Cao Sun, Yun-Lei Jiang, Hao Yuan, Hui-Qiu Cao, Guang-Han |
| contents | We report experimental and theoretical investigations on ThCr$_2$Ge$_2$C, a metallic compound in which Cr$_2$C planes form a square-planar lattice. Neutron powder diffraction, magnetization, and specific heat measurements reveal no evidence of long-range magnetic order or short-range spin freezing down to 70~mK. Quantum critical behavior was indicated through logarithmic divergences in both the magnetic susceptibility and the specific heat divided by temperature. Resistivity measurements exhibit non-Fermi-liquid behavior, with a Fermi liquid recovered under magnetic fields or high pressures. First-principles calculations identify competing nearest-neighbor ($J_1$) and next-nearest-neighbor ($J_2$) exchange interactions, with $J_2/J_1 \sim -0.5$, pointing to strong magnetic frustration. The interaction frustration is reduced, and magnetically ordered phases are stabilized upon the application of negative or positive pressures. This work offers a rare example of zero-field, ambient pressure quantum criticality mainly driven by interaction frustration in a square lattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_22362 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum Criticality by Interaction Frustration in a Square-Planar Lattice Lin, Yi-Qiang Liu, Chang-Chao Li, Jia-Xin Lv, Bai-Jiang Ye, Kai-Xin Zhang, Jia-Wen Wu, Si-Qi Zhang, Ya-Nan Chen, Ye Lu, Jia-Yi Li, Jing Li, Hua-Xun Li, Hao Liu, Yi Wang, Cao Sun, Yun-Lei Jiang, Hao Yuan, Hui-Qiu Cao, Guang-Han Strongly Correlated Electrons Materials Science We report experimental and theoretical investigations on ThCr$_2$Ge$_2$C, a metallic compound in which Cr$_2$C planes form a square-planar lattice. Neutron powder diffraction, magnetization, and specific heat measurements reveal no evidence of long-range magnetic order or short-range spin freezing down to 70~mK. Quantum critical behavior was indicated through logarithmic divergences in both the magnetic susceptibility and the specific heat divided by temperature. Resistivity measurements exhibit non-Fermi-liquid behavior, with a Fermi liquid recovered under magnetic fields or high pressures. First-principles calculations identify competing nearest-neighbor ($J_1$) and next-nearest-neighbor ($J_2$) exchange interactions, with $J_2/J_1 \sim -0.5$, pointing to strong magnetic frustration. The interaction frustration is reduced, and magnetically ordered phases are stabilized upon the application of negative or positive pressures. This work offers a rare example of zero-field, ambient pressure quantum criticality mainly driven by interaction frustration in a square lattice. |
| title | Quantum Criticality by Interaction Frustration in a Square-Planar Lattice |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2507.22362 |