Pressure-induced phase transitions and superconductivity in <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>PbSnSe</mi><mn>2</mn></msub></math>

Jiajia Feng; Junlong Li; Cong Li; Chutong Zhang; Juefei Wu; Wenhui Liu; Zhixiang Hu; Fuyang Liu; Hongliang Dong; Ya Gao; Jingwei Miao; Xiangzhuo Xing; Yanchun Li; Zhiqiang Chen; Cedomir Petrovic; Bin Chen

doi:10.1103/kdjg-4qy9

Pressure-induced phase transitions and superconductivity in ${PbSnSe}_{2}$

Jiajia Feng ^1,*, Junlong Li^1,2, Cong Li ^1,3, Chutong Zhang⁴, Juefei Wu⁵, Wenhui Liu⁶, Zhixiang Hu¹, Fuyang Liu¹, Hongliang Dong^1,7 et al.

Ya Gao¹, Jingwei Miao¹, Xiangzhuo Xing⁴, Yanchun Li², Zhiqiang Chen¹, Cedomir Petrovic ^1,7, and Bin Chen ^1,7,8,†

¹Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
²Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, China
³Key Laboratory of Intelligent Optoelectronic Devices and Chips of Jiangsu Higher Education Institutions, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China
⁴Laboratory of High Pressure Physics and Material Science (HPPMS), School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China
⁵School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
⁶Institute of Quantum Materials and Physics, Henan Academy of Sciences, Zhengzhou 450046, China
⁷Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments, Shanghai Advanced Research in Physical Sciences, Shanghai 201203, China
⁸School of Science, Harbin Institute of Technology, Shenzhen 518055, China

^*Contact author: jiajia.feng@hpstar.ac.cn
^†Contact author: chenbin@hpstar.ac.cn

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Phys. Rev. B 114, 084507 – Published 17 August, 2026

DOI: https://doi.org/10.1103/kdjg-4qy9

Abstract

Superconductivity is intrinsically linked to the crystal structure of materials, and structural heterogeneity under high pressure often yields broadened or mixed superconducting transitions. Here instead we report multiple superconducting phases in compressed ${PbSnSe}_{2}$ : two well-separated superconducting transitions that coexist over a broad pressure range and are associated with two crystallographically distinct phases as established by in situ high-pressure x-ray diffraction. Electrical transport and DC magnetization measurements, reproduced across independent samples, consistently resolve both transitions and their evolution under compression. First-principles calculations show that the two structures possess distinct electron-phonon coupling, dominated in both cases by Se-related phonon modes, providing a direct link between the structural symmetry and the superconducting pairing strength. These results illuminate the microscopic connection between phase transitions and superconductivity in layered chalcogenides, and provide a clean platform for exploring the intricacy of the underlying physics.

Physical Review B

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Pressure-induced phase transitions and superconductivity in ${PbSnSe}_{2}$

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Pressure-induced phase transitions and superconductivity in PbSnSe2

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Pressure-induced phase transitions and superconductivity in ${PbSnSe}_{2}$