Cage mesh structure palladium-based alkaline earth metal alloy superconducting material

Abstract

The invention discloses a cage-mesh-structure palladium-based alkaline earth metal alloy superconducting material, and belongs to the technical field of new superconducting materials. According to the technical scheme, the molecular formula of the palladium-based alkaline earth metal alloy superconducting material with the cage-mesh structure is MPd5, the palladium-based alkaline earth metal alloy superconducting material with the cage-mesh structure is of a cage-mesh lattice structure, a cage-mesh lattice structure layer is mainly formed by stacking palladium atoms, alkaline earth metal atoms are located in the center positions of the palladium atoms of the cage-mesh layer, the crystal space group is P6 / mmm (No.161), and the point group is D6h. The superconducting transition temperature of the cage-mesh-structure palladium-based alkaline earth metal alloy superconducting material can be finely adjusted by applying external pressure or / and a carrier doping method. The cage-mesh-structure palladium-based alkaline earth metal alloy superconducting material designed by the invention has the advantages of simple structure, high superconducting transition temperature, adjustable pressure, rich properties and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of new palladium-based alkaline earth metal alloy superconducting materials, and in particular relates to a cage-structured palladium-based alkaline earth metal alloy superconducting material. Background Art

[0002] The Kagome lattice structure is composed of equilateral triangles with shared corners, forming a hexagonal pattern. This style of lattice is not only an aesthetically striking structure, but also an excellent platform for physical research that contains extremely rich physical properties, especially in the fields of condensed matter physics and magnetism. In recent decades, a large number of studies have focused on exploring the many-body effects, quantum phenomena and potential applications caused by this unique structure. In addition to the characteristics of geometric frustration in structure, Kagome lattice materials also exhibit a series of exotic physical properties in their microscopic electronic states. For example, a flat band characteristic is exhibited in their electronic band structure. Materials with Kagome lattice structures can also exhibit superconductivity. Kagome structure superconductors are a new type of superconducting material discovered in recent years, such as (135)-type CsV 3 Sb 5 , CsCr 3 Sb 5 etc., (166) type AV 6 Sb 6 (A=K, Rb, Cs), (132) type LaRu 3 Si 2 etc. These cage-structured superconducting materials have attracted great attention by showing unconventional superconductivity, charge density waves and topological surface states. Many theoretical predictions and experimental studies have also shown that cage-structured lattices have become an important platform for studying electron correlation and non-trivial topology. If more colorful physical states are found in cage-structured materials and they are regulated to achieve low-energy, highly stable topological quantum computing, it will set off another wave in the field of physics research. At present, the attention to superconducting behavior in cage-structured materials has always been very high. Seeking materials with simpler elements, easier preparation and higher superconducting transition temperatures has always been an important step for researchers exploring superconducting behavior. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a cage-structured palladium-based alkaline earth metal alloy superconducting material with a simple structure, high superconducting transition temperature, adjustable pressure and rich properties.

[0004] The present invention adopts the following technical solution to solve the above technical problems: a cage-structured palladium-based alkaline earth metal alloy superconducting material, characterized in that: the molecular formula of the palladium-based alkaline earth metal alloy superconducting material is MPd5 , with a cage lattice structure, the cage lattice structure layer is mainly composed of palladium atoms stacked, the alkaline earth metal atoms are located in the center of the cage layer palladium atoms, the crystal space group is P6 / mmm (No.161), point group is D 6h , where M is an alkaline earth metal.

[0005] Furthermore, the cage-structured palladium-based alkaline earth metal alloy superconducting material has a stable structure under normal pressure, and the superconductivity of the cage-structured palladium-based alkaline earth metal alloy superconducting material can be effectively adjusted and enhanced by applying external pressure and / or carrier doping.

[0006] Furthermore, the cage structure CaPd in ​​the cage structure palladium-based alkaline earth metal alloy superconducting material 5 Alloy superconducting materials are materials with the highest intrinsic superconducting transition temperature, which is 2.64K. Under the action of external pressure, the cage structure CaPd 5 The superconducting transition temperature of the alloy material can be increased to 2.85K.

[0007] Compared with the prior art, the present invention has the following advantages and beneficial effects: the cage-structured palladium-based alkaline earth metal alloy superconducting material designed by the present invention has the characteristics of simple structure and superconducting transition temperature; the superconducting transition temperature of the cage-structured palladium-based alkaline earth metal alloy superconducting material can be fine-tuned by applying external pressure and / or carrier doping; the cage-structured palladium-based alkaline earth metal alloy superconducting material also has some other novel physical properties, such as flat bands, multiple Dirac points and non-trivial topological physical properties. The cage-structured palladium-based alkaline earth metal alloy superconducting material designed by the present invention has the advantages of simple structure, high superconducting transition temperature, adjustable pressure, rich properties, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the crystal structure of a cage-structured palladium-based alkaline earth metal alloy superconducting block. The top figure is a top view, and the bottom figure is a side view. The palladium atomic layer is a cage-shaped lattice, consisting of six rings and a triangular lattice, and the center of the cage-shaped atomic layer is an alkaline earth metal atom.

[0009] Figure 2 It is a cage structure CaPd 5 Pressure-superconducting transition temperature curve of superconducting bulk. DETAILED DESCRIPTION

[0010] The above contents of the present invention are further described in detail below through embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following implementations, and all technologies implemented based on the above contents of the present invention belong to the scope of the present invention.

[0011] The invention constructs a cage-structured palladium-based alkaline earth metal alloy superconducting material composed of alkaline earth metal and palladium. The molecular formula of the palladium-based alkaline earth metal alloy superconducting material is MPd 5 , M is an alkaline earth metal with a cage lattice structure. The cage lattice structure layer is mainly composed of palladium atoms stacked together. The alkaline earth metal atom is located at the center of the cage layer palladium atom. The crystal space group is P6 / mmm (No.161), point group is D 6h The preparation of the palladium-based alkaline earth metal alloy superconducting material can be achieved using traditional material preparation methods, such as mixed physical and chemical vapor deposition method, powder method, solid phase reaction method, electron beam evaporation method, co-evaporation method, sputtering method, etc.

[0012] The present invention tests the superconducting transition temperature by using the industry's advanced superconductor density functional method, and regulates the superconducting transition temperature by applying external pressure and carrier doping. By measuring its superconductivity, the superconducting transition temperature of the cage-structured palladium-based alkaline earth metal alloy superconducting material is determined, providing an important theoretical basis and specific structural model data for further preparation of superconducting materials with simple structure and high transition temperature.

[0013] The cage-structured palladium-based alkaline earth metal alloy superconducting material described in the present invention has a stable structure under normal pressure. 5 Alloy superconducting materials are materials with the highest intrinsic superconducting transition temperature, which is 2.64K. By applying external pressure and / or carrier doping, the superconductivity of cage-structured palladium-based alkaline earth metal alloy superconducting materials can be effectively adjusted and enhanced, especially under the action of external pressure, the cage-structured CaPd 5 The superconducting transition temperature of the alloy material can be increased to 2.85K.

[0014] like Figure 1 The figure shows the crystal structure of the cage-structured palladium-based alkaline earth metal alloy superconducting material designed by the present invention, which exhibits many excellent physical properties, such as flat bands, multiple Dirac points, non-trivial topological properties, etc. The cage-structured palladium-based alkaline earth metal alloy superconducting material designed by the present invention has the characteristics of simple structure, clear superconducting transition temperature, adjustable external stress, rich properties, etc., and can be applied to superconducting materials and topological materials.

[0015] In addition, alloy materials having the same structure as the cage-structured palladium-based alkaline earth metal alloy discovered in the present invention may also exhibit superconductivity and topology, and can be applied to the fields of superconducting materials and topological materials.

[0016] The above embodiments describe the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the scope of the principles of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of protection of the present invention.

Claims

1. A cage-structured palladium-based alkaline earth metal alloy superconducting material, characterized in that: The molecular formula of the palladium-based alkaline earth metal alloy superconducting material is MPd5, and it has a cage lattice structure. The cage lattice structure layer is mainly composed of palladium atoms stacked, and the alkaline earth metal atoms are located at the center of the cage layer palladium atoms. The crystal space group is P6 / mmm (No.161) and the point group is D 6h , in the molecular formula, M is an alkaline earth metal.

2. The cage-structured palladium-based alkaline earth metal alloy superconducting material according to claim 1, characterized in that: The cage-structured palladium-based alkaline earth metal alloy superconducting material has a stable structure under normal pressure, and the superconductivity of the cage-structured palladium-based alkaline earth metal alloy superconducting material can be effectively adjusted and enhanced by applying external pressure and / or carrier doping.

3. The cage-structured palladium-based alkaline earth metal alloy superconducting material according to claim 1, characterized in that: Among the cage-structured palladium-based alkaline earth metal alloy superconducting materials, the cage-structured CaPd5 alloy superconducting material has the highest intrinsic superconducting transition temperature, which is 2.64K. Under the action of external pressure, the superconducting transition temperature of the cage-structured CaPd5 alloy material can be increased to 2.85K.

Images