论文标题
单晶生长和超导率rbni $ _2 $ se $ _2 $
Single crystal growth and superconductivity in RbNi$_2$Se$_2$
论文作者
论文摘要
我们报告了rbni $ _2 $ se $ _2 $的合成和表征，这是对铁粉红色的超导型rb $ _x $ _x $ _x $ _2 $ _2 $ se $ _2 $的类似物，通过运输，安格分析的光发射光谱镜头和密度函数理论计算。确定了$ T_ {C} $ = 1.20 K的超导过渡。在正常状态下，RBNI $ _2 $ SE $ _2 $显示顺磁性和费米液体行为。一个大的Sommerfeld系数产生的重型电子质量为$ M^{*} \大约6m_ {e} $。在超导状态下，零场电子特异性热数据$ c_ {es} $可以由两间隙BCS型号描述，表明RBNI $ _2 $ _2 $ SE $ _2 $是多间隙超导体。我们的密度功能理论计算和角度分辨光发射光谱测量表明，rbni $ _2 $ se $ _2 $表现出相对较弱的相关性和多波段特征，与多间隙超导性一致。
We report the synthesis and characterization of RbNi$_2$Se$_2$, an analog of the iron chalcogenide superconductor Rb$_x$Fe$_2$Se$_2$, via transport, angle resolved photoemission spectroscopy, and density functional theory calculations. A superconducting transition at $T_{c}$ = 1.20 K is identified. In normal state, RbNi$_2$Se$_2$ shows paramagnetic and Fermi liquid behaviors. A large Sommerfeld coefficient yields a heavy effective electron mass of $m^{*}\approx6m_{e}$. In the superconducting state, zero-field electronic specific-heat data $C_{es}$ can be described by a two-gap BCS model, indicating that RbNi$_2$Se$_2$ is a multi-gap superconductor. Our density functional theory calculations and angle resolved photoemission spectroscopy measurements demonstrate that RbNi$_2$Se$_2$ exhibits relatively weak correlations and multi-band characteristics, consistent with the multi-gap superconductivity.
