Crystal structure and superconducting properties of Sc5Ir6Sn18
Crystal structure and superconducting properties of Sc5Ir6Sn18
复制标题
DOI：
10.1088/1361-648x/ab32d0
复制
发表时间：
2019-11-06
影响因子：
2.7
通讯作者：
Gumeniuk, Roman
中科院分区：
文献类型：
--
作者：
Levytskyi, Volodymyr;Feig, Manuel;Gumeniuk, Roman
Sc 5Ir 6Sn 18以Tb 5 Rh 6Sn 18结构类型的分裂变体（空间群I4（1）/acd，a = 13.5826（2）埃，c = 27.1504（6）埃）结晶。DFT计算证实了结构排列的不稳定性，完全占据和未分裂的晶体位置。从Sn熔体中生长出高质量的单晶。Sc 5Ir 6Sn 18是一种抗磁性金属，在临界温度T-c = 2.64 K下显示出超导转变。临界磁场B-c ~ 2（0）约为3.2T，比热比Δ c（p）/γ T-N（c）= 1.73（3），能隙比Δ（0）/k（B）T（c）= 1.85（1），表明该系统是一个弱耦合的类BCS超导体。
Sc5Ir6Sn18 crystallizes with a split variant of the Tb5Rh6Sn18 structure type (space group I4(1)/acd, a = 13.5826(2) angstrom, c = 27.1504(6) angstrom). DFT calculations confirmed the instability of the structural arrangement with the fully occupied and unsplit crystallographic sites. high quality single crystals were grown from a Sn melt. Sc5Ir6Sn18 is a diamagnetic metal showing a superconducting transition at a critical temperature T-c = 2.64 K. The relatively low critical magnetic field B-c2(0) approximate to 3.2 T as well as the obtained values of the specific heat ratio Delta c(p)/gamma T-N(c) = 1.73(3) and energy-gap ratio Delta(0)/k(B)T(c) = 1.85(1) suggest this system to be a weakly coupled BCS-like superconductor.