论文标题
超导率通过$ d $ -band填充la $ tr_2 $ al $ _ {20} $，$ tr $ = mo = mo和w
Superconductivity enhanced by $d$-band filling in La$Tr_2$Al$_{20}$ with $Tr$ = Mo and W
论文作者
论文摘要
LA $ TR_2 $ al $ _ {20} $的单晶上的电阻率，磁化率和特定的热量测量，带有$ Tr $ = MO和W显示，这些化合物在过渡温度下表现出超导性$ T_C $ = 3.22 $ = 3.22 $ = 3.22 $ $ = 3.22和1.81 k，在报告的LA $ tr_ $ tr_ $ __的最高价值中，可以实现。 $ t_c $与电子特定热系数之间似乎存在正相关，这会随着$ 4D $ - 和$ 5D $ -ELECTRON的增加而增加。这一发现表明，在$ 4D $中填充$ E_G $轨道，而$ 5D $ bands则在显着增强超导式冷凝能量方面起着至关重要的作用。讨论了$ d $电子在$ rtr_ {2} $ al $ _ {20} $中出现的紧密相关的电子现象中扮演的可能角色。
Electrical resistivity, magnetic susceptibility, and specific heat measurements on single crystals of La$Tr_2$Al$_{20}$ with $Tr$ = Mo and W revealed that these compounds exhibit superconductivity with transition temperatures $T_c$ = 3.22 and 1.81 K, respectively, achieving the highest values in the reported La$Tr_2$Al$_{20}$ compounds. There appears a positive correlation between $T_c$ and the electronic specific heat coefficient, which increases with increasing the number of $4d$- and $5d$-electrons. This finding indicates that filling of the upper $e_g$ orbitals in the $4d$ and $5d$ bands plays an essential role for the significant enhancement of the superconducting condensation energy. Possible roles played by the $d$ electrons in the strongly correlated electron phenomena appearing in $RTr_{2}$Al$_{20}$ are discussed.
