论文标题
超导性的增强及其与Inte晶格扩展的关系
Enhancement of superconductivity and its relation to lattice expansion in InTe
论文作者
论文摘要
寻求管理超导性背后的驱动力并对超导过渡温度$ t_ {c} $的控制权与现象本身一样古老。从显微镜上讲，这需要正确理解其参数空间中电子静态相互作用的演变。我们通过微调$ _ {x} $ te在$ _ {x} $ te中通过微调$ x $ $ x $报告了这样的对照研究。我们发现，将$ x $从0.84增加到1个会导致$ t_ {c} $从1.3 k提高到3.5 K，伴随着电子偶联常数从0.45增加到0.63。我们使用第一原理计算，我们表明这种行为是由两个因素驱动的，每个因素都取决于$ x $。对于$ x \ Lessim 0.92 $，主要角色是由费米级别的电子状态密度扮演的。高于$ x \ sim 0.92 $，状态密度变平的变化，而增强$ t_ {c} $的增强仍在继续。我们将其归因于晶格振动的系统软化，放大电子耦合，因此，$ t_ {c} $。
The quest to govern the driving forces behind superconductivity and gain control over the superconducting transition temperature $T_{c}$ is as old as the phenomenon itself. Microscopically, this requires a proper understanding of the evolution of electron-lattice interactions in their parameter space. We report such a controlled study on $T_{c}$ in In$_{x}$Te via fine-tuning the In stoichiometry $x$. We find that increasing $x$ from 0.84 to 1 results in an enhancement of $T_{c}$ from 1.3 K to 3.5 K accompanied by an increase of the electron-phonon coupling constant from 0.45 to 0.63. Employing first-principles calculations, we show that this behavior is driven by two factors, each taking the dominant role depending on $x$. For $x\lesssim 0.92$, the major role is played by the density of electronic states at the Fermi level. Above $x\sim 0.92$, the change in the density of states flattens while the enhancement of $T_{c}$ continues. We attribute this to a systematic softening of lattice vibrations, amplifying the electron-phonon coupling, and hence, $T_{c}$.
