论文标题
等值型高渗透合金HFMONBTIZR的超导性和硬度
Superconductivity and hardness of the equiatomic high-entropy alloy HfMoNbTiZr
论文作者
论文摘要
我们发现，以身体为中心的立方体（BCC）HFMONBTIZR是一种II型BCS高渗透合金（HEA）超导体，具有$ T_ \ MATHRM {C C} $ = 4.1 K的超导临界温度，并雇用了Debye温度$θ_\ Mathrm {d debye $θ_\ Mathrm {d d} $ 263电子偶联常数$λ_\ mathrm {e-p} $计算为0.63。电子结构计算揭示了由于原子疾病引起的能量不确定性的带宽。在等准Quinary BCC Hea超导体中比较了超导能。 $ t_ \ mathrm {c} $减小，随着$λ_\ mathrm {e-p} $的减少，它与$θ_{d} $负相关。 $λ_\ mathrm {e-p} $和$θ_{d} $之间的负相关性是由较短的拼音寿命以较高的$θ_{d} $引起的，该寿命基于原子障碍和不确定性原理引起的声子扩展。测量了几个BCC HEA超导体的Vickers Microhardness。 $ t_ \ mathrm {c} $在硬度相对较高的超导体中非常低，因为硬度通常会随着$θ_\ mathrm {d} $的增加而增加，而$θ_\ mathrm {d} $与$ t_ \ mathrm {c} $ can c} $ ncorm-nnond of the高-Mathrm {d} $是负相关的。
We have found that body-centered cubic (bcc) HfMoNbTiZr is a type-II BCS high-entropy alloy (HEA) superconductor with a superconducting critical temperature of $T_\mathrm{c}$=4.1 K. By employing a Debye temperature $θ_\mathrm{D}$ of 263 K and $T_\mathrm{c}$, the electron-phonon coupling constant $λ_\mathrm{e-p}$ is calculated to be 0.63. The electronic structure calculation revealed band broadening with energy uncertainties due to atomic disorders. The superconducting properties are compared among equiatomic quinary bcc HEA superconductors. $T_\mathrm{c}$ decreases with decreasing $λ_\mathrm{e-p}$, which is negatively correlated with $θ_{D}$. The negative correlation between $λ_\mathrm{e-p}$ and $θ_{D}$ would be caused by a shorter phonon lifetime at a higher $θ_{D}$, which is based on phonon broadening due to atomic disorder and the uncertainty principle. The Vickers microhardness was measured for several bcc HEA superconductors. $T_\mathrm{c}$ is exceptionally low in a superconductor with relatively high hardness, because the hardness generally increases with increasing $θ_\mathrm{D}$, and $θ_\mathrm{D}$ is negatively correlated with $T_\mathrm{c}$ in the high-entropy state.
