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Hefei Research Institute and others have made progress in the research of new states of matter under high pressure
[ Instrument network instrument research and development ] Recently, the high-voltage research team of the High Magnetic Field Science Center of the Hefei Research Institute of the Chinese Academy of Sciences cooperated with Anhui University, the University of Southern Denmark, and Nanjing University to discover a superconductor with a novel structure using high-voltage research methods. The relevant research results are titled Long-Range Ordered Amorphous Atomic Chains as Building Blocks of a Superconducting Quasi-One-Dimensional Crystal and published on Advanced Materials.
Solid materials can be divided into crystalline, amorphous and quasi-crystals according to their structure: generally speaking, crystals have both long-range and short-range translational or rotationally symmetric sequences; amorphous medium- and short-range order but not long-range order; quasi-crystals have long-range Rotational symmetry order without long-range translational symmetry order. Materials with long-range order but short-range disorder are very rare in nature.
The team selected (TaSe4)2I with a quasi-one-dimensional chain-like structure as the research object. The TaSe4 chain, which is the main structural unit of the structure, extends in the c direction and is arranged in parallel with each other, while nesting with the I atom chain in the c direction. , Which together form a three-dimensional lattice. Due to the characteristics of (TaSe4)2I quasi-one-dimensional chain structure, it is a typical charge density wave material; from the topological classification of electronic energy band structure, it is found that its high temperature phase is Weyl semimetal, and it enters with the charge density wave transformation system at low temperature. A so-called shaft insulation state. The research team used diamond to generate a high-pressure environment for the anvil device. Through synchrotron radiation X-ray diffraction experiments, it was found that (TaSe4)2I was amorphized in the TaSe4 chain above 20 GPa, but the chain still maintained long-range order (as shown in the picture) , Thus showing the short-range disorder of the atomic arrangement but the long-range order "combination" phenomenon in the structure. Along with the amorphization inside the atomic chain, the system also exhibits superconductivity. Consistent with the novel structure under high pressure, the superconductivity exhibits a two-step transformation, that is, superconductivity appears in the atomic chain first, and the coupling between the atomic chains leads to zero resistance in long-range coherence. This research expands the understanding of the traditional classification of solid materials and provides an ideal platform for studying quasi-one-dimensional superconductivity.
Dr. An Chao from Anhui University, a member of the high-voltage research team, is the first author of the paper, and Dr. Xuliang Chen, professor Zhang Gufei (University of Southern Denmark) and researcher Yang Zhaorong are the co-corresponding authors of the paper.