Disorder‐Broadened Phase Boundary with Enhanced Amorphous Superconductivity in Pressurized In 2 Te 5

作者：Yi Zhao, Tianping Ying, Lingxiao Zhao, Juefei Wu, Cuiying Pei, Jing Chen, Jun Deng, Qinghua Zhang, Lin Gu, Qi Wang, Weizheng Cao, Changhua Li, Shihao Zhu, Mingxin Zhang, Na Yu, Lili Zhang, Yulin Chen, Chui‐Zhen Chen, Tongxu Yu, Yanpeng Qi · 发表于：Advanced Materials · 年份：2024 · DOI：10.1002/adma.202401118 · 被引用次数：10 · 研究领域：Phase-change materials and chalcogenides、Advanced Condensed Matter Physics、Theoretical and Computational Physics

Abstract As an empirical tool in materials science and engineering, the iconic phase diagram owes its robustness and practicality to the topological characteristics rooted in the celebrated Gibbs phase law free variables (F) = components (C) – phases (P) + 2. When crossing the phase diagram boundary, the structure transition occurs abruptly, bringing about an instantaneous change in physical properties and limited controllability on the boundaries (F = 1). Here, the sharp phase boundary is expanded to an amorphous transition region (F = 2) by partially disrupting the long‐range translational symmetry, leading to a sequential crystalline–amorphous–crystalline (CAC) transition in a pressurized In 2 Te 5 single crystal. Through detailed in situ synchrotron diffraction, it is elucidated that the phase transition stems from the rotation of immobile blocks [In 2 Te 2 ] 2+ , linked by hinge‐like [Te 3 ] 2− trimers. Remarkably, within the amorphous region, the amorphous phase demonstrates a notable 25% increase of the superconducting transition temperature ( T c ), while the carrier concentration remains relatively constant. Furthermore, a theoretical framework is proposed revealing that the unconventional boost in amorphous superconductivity might be attributed to an intensified electron correlation, triggered by a disorder‐augmented multifractal behavior. These findings underscore the potential of disorder and prompt further exploration of unforeseen phenomena on the phase boundari...