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arXiv · 2512.15667

Pressure-Induced Changes in Structure, Magnetic Order and Development of Superconductivity in the Ferromagnetic Topological Insulator MnBi8Te13

S. Huyan·T. Qian·L. Wang·W. Bi·F. Xue·D. Zhang·C. Hu·B. Kalkan·Y. Huang·Z. Li·A. Das·J. Schmidt·R. A. Ribeiro·T. J. Slade·N. Ni·P. C. Canfield·S. L. Bud'ko
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Abstract

We report a comprehensive study of pressure-induced evolution of the magnetism and development of superconductivity (SC) in MnBi8Te13, a promising ambient pressure, ferromagnetic (FM) topological insulator candidate. By employing high-pressure electrical transport, magnetoresistance, DC magnetic susceptibility, and X-ray diffraction measurements, we construct a detailed temperature-pressure phase diagram. At ambient pressure, MnBi8Te13 exhibits FM ordering with an easy-axis along the c-axis which is progressively suppressed under pressure and replaced by an antiferromagnetic (AFM) order. Density functional theory calculations predicted an evolution from FM to a G-type AFMg2 phase near 5 GPa. Above 16.6 GPa, a bulk SC state emerges with a maximum transition temperature ~6.8 K, as confirmed by resistance and magnetic susceptibility measurements. This pressure-induced SC may co-exist with another AFM dome that shows a weak anomaly in the transport data. In contrast, our work on MnBi6Te10 shows no SC up to 40 GPa. Indeed, in contrast to MnBi8Te13, the MnBi2Te4(Bi2Te3)n compounds with n < 3, didn't exhibit SC, highlighting the crucial role of Mn concentration in stabilizing SC. The observation of pressure-induced FM-AFM-SC transitions in MnBi8Te13 not only establishes it as a rare Mn-based SC but also provides a platform to study the interplay between magnetism, SC, and potentially nontrivial band topology in correlated magnetic materials.

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S. Huyan, T. Qian, L. Wang, W. Bi, F. Xue, D. Zhang, C. Hu, B. Kalkan, Y. Huang, Z. Li, A. Das, J. Schmidt, R. A. Ribeiro, T. J. Slade, N. Ni, P. C. Canfield, S. L. Bud'ko. 2025-12-17. Pressure-Induced Changes in Structure, Magnetic Order and Development of Superconductivity in the Ferromagnetic Topological Insulator MnBi8Te13. https://arxiv.org/abs/2512.15667

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