Design of high-temperature superconductors at moderate pressures by alloying AlH3 or GaH3
作者机构：Center for High Pressure Science(CHiPS)State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China School of Materials Science and EngineeringHenan University of TechnologyZhengzhou 450001China Department of ChemistryState University of New York at BuffaloBuffaloNew York 14260-3000USA Physics Department and EHU Quantum CenterUniversity of the Basque CountryUPV/EHU48080 BilbaoSpain Donostia International Physics Center(DIPC)20018 DonostiaSpain Centro de Física de Materiales CFMCentro Mixto CSIC-UPV/EHU20018 DonostiaSpain Extreme Conditions Physics Research TeamCollege of Physics and Electronic InformationInner Mongolia Minzu UniversityTongliao 028043China
出 版 物：《Matter and Radiation at Extremes》 (极端条件下的物质与辐射（英文）)
年 卷 期：2024年第9卷第1期
页 面：94-103页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：supported by the Natural Science Foundation of China(Grant Nos.52022089,52372261,52288102,and 11964026) the National Key R&D Program of China(Grant No.2022YFA1402300) the Natural Science Foundation of Hebei Province(Grant No.E2022203109) the Doctoral Fund of Henan University of Technology(Grant No.31401579) P.L.thanks the Science and Technology Leading Talents and Innovation Team Building Projects of the Inner Mongolia Autonomous Region(Grant No.GXKY22060) financial support from the Spanish Ministry of Science and Innovation(Grant No.FIS2019-105488GB-I00) the Department of Education,Universities and Research of the Basque Government and the University of the Basque Country(Grant No.IT1707-22) the National Science Foundation(Grant No.DMR-2136038)for financial support
主 题：alloying alloys superconductors
摘 要：Since the discovery of hydride superconductors,a significant challenge has been to reduce the pressure required for their *** this context,we propose that alloying could be an effective strategy to achieve *** focus on a series of alloyed hydrides with the AMH_(6)composition,which can be made via alloying A15 AH_(3)(A=Al or Ga)with M(M=a group IIIB or IVB metal),and study their behavior under *** of them are predicted to maintain the A15-type structure,similar to AH_(3)under pressure,providing a platform for studying the effects of alloying on the stability and superconductivity of AH_(3).Among these,the A15-type phases of AlZrH_(6)and AlHfH_(6)are found to be thermodynamically stable in the pressure ranges of 40–150 and 30–181 GPa,***,they remain dynamically stable at even lower pressures,as low as 13 GPa for AlZrH_(6)and 6 GPa for AlHfH_(6).These pressures are significantly lower than that required for stabilizing A15 ***,the introduction of Zr or Hf increases the electronic density of states at the Fermi level compared with *** enhancement leads to higher critical temperatures(Tc)of 75 and 76 K for AlZrH_(6)and AlHfH_(6)at 20 and 10 GPa,*** the case of GaMH_(6)alloys,where M represents Sc,Ti,Zr,or Hf,these metals reinforce the stability of the A15-type structure and reduce the lowest thermodynamically stable pressure for GaH_(3) from 160 GPa to 116,95,80,and 85 GPa,*** noteworthy are the A15-type GaMH_(6)alloys,which remain dynamically stable at low pressures of 97,28,5,and 6 GPa,simultaneously exhibiting high Tc of 88,39,70,and 49 K at 100,35,10,and 10 GPa,***,these findings enrich the family of A15-type superconductors and provide insights for the future exploration of high-temperature hydride superconductors that can be stabilized at lower pressures.
维普期刊数据库