Progress | Development of Calcium -based Rich Hydrogen Materials and high -pressure superconducting above 210K

Hydrogen, as the element cycle, is an important component of the vast universe entity. The research on hydrogen at the beginning of the last century promoted the formation of early quantum science. So far, the legend and story of hydrogen have continued. Wigner and Huntington have theoretical predictions in the 1930s that in sufficient pressure, hydrogen will be converted from normal pressure gaseous to solid metals like alkaline metals. Due to the high temperature of DBei, the classic BCS theory based on electrolytic coupling, metal hydrogen may have high temperature superconducting properties. However, the theoretical estimate of the metalization of hydrogen requires about 500 GPA extreme high -pressure (1GPA ~ 10,000 atmospheric pressure), exceeding the current level of high -pressure experimental technology, and pure hydrogen metalization is far away. In the 1970s, Xu Jian and others of the Institute of Physics of the Chinese Academy of Sciences proposed that the concept of reducing hydrogen metalized pressure through the introduction of hydrogen -enriched compounds (Physics 6, 296 (1977)). In 2004, Professor Ashcroft further discussed that the hydrogen -rich compound could reduce the pressure required for hydrogen metalization, and at the same time, it still retained the high -temperature super -guide attribute mainly hydrogen -based. These theoretical ideas and predictions have been further promoted by the Jilin University team. In recent years, internationally reported that it has observed the high -temperature superconducting phenomenon of more than 200K in sulfur and rare earth hydrogenation experiments.

Figure 1: Calcium -based hydrogen -rich materials are more than 210 K high -temperature superconducting properties in high voltage: Sample A superconductive electrical transformation of 160GPa in dignital high pressure and cooling process (A) Conductive transformation (B).

The Institute of Physics of the Chinese Academy of Sciences/Beijing Concrete State Physics National Research Center Jin Changqing and Wang Xiancheng team have long been committed to the preparation and functional regulation of high -pressure extremist new materials for a long time. Comprehensive experimental devices for strong fields and laser heating can be conducted on ultra -high -pressure and high temperature synthesis and consolidated synthesis. Based on the above -mentioned advanced extremist technologies, they have successively revealed the new effects of functional materials induced by a series of high -voltage, including emerging functional materials systems such as association, topology, polymer ); JACS 133, 7892 (2011); PNAS 110, 17263 (2013); Nature Commun. 5, 3731 (2014); Adv. Mater. 29, 1700715 (2017); Angew. Chem. Int. Ed. 56, 1 (2017); NPG Asia Mater. 11, 60 (2019)). Recently, their high -voltage synthesis and experiments found that TC's 71k -gravated hydrogen -rich hydrogen -rich superconducting material, which is the first 4D transition metal hydrogen -rich high -temperature superconducting material (SCI. Bull. 67, 907 (2022)).

Figure 2: The high -voltage superconducting transformation of calcium -based hydrogen -rich superconducting materials is evolved with magnetic field evolution (A); estimated the critical field value (B).

Recently, Jin Changqing and Wang Xiancheng have made new progress in the research of rich hydrogen -rich materials and superconducting. They guided doctoral students Li Yanwen and He Xin and other new materials for calcium -based hydrogen -rich superconductors. First of all, the use of high -pressure and high temperature technology, successfully prepared a calcium -rich new compounds in 160 to 180 GPA and 2000 K. Furthermore, at 160 to 180 GPA high pressure, the experiment observed the superconducting transition of TC ~ 210 K (Figure 1, B). Based on the change of the superconducting change, with the change of the magnetic field, it is estimated that the critical field of the superconductor is about 268 TESLA, and the length of the Ginzburg-Landau superconducting is 11 å (Figure 2A, B). High -voltage synchronous radiation structure representation shows that superconducting samples include CAH6 and other hydrogen -rich phases. The amount of body bullets that obtain a hydrogen -rich phase through high -voltage state equations are about 221 GPA (Figure 3A, B).

Figure 3: High -voltage synchronous radiation X -ray diffraction experiments of calcium -based hydrogen -rich superconducting materials (A); high -pressure state equation (B) of hydrogen -rich phase.

In summary, calcium -based hydrogen -rich superconducting materials have become another TC dual -rich hydrogen -rich high -temperature superconducting material with more TCs than 200 K of secondary hydrogen sulfur and rare earth metal hydrogen, which expands the research category of high -temperature superconducting materials.

The above research work was recently published in Nature Communication 13, 2863 (2022). Wang Xiancheng and Jin Changqing were the authorities of the communications and received funding from the Fund Commission, the Ministry of Science and Technology and the Chinese Academy of Sciences (11921004, 2018yfa0305701, XDB33010200).

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