论文标题
在V型MG $ _ {1-δ} $ ti $ _2 $ o $ $ _4 $的v掺杂毫克的表面层中的超导率的可能路线，并通过多重收费转移和抑制Jahn-Teller活动
Possible routes to superconductivity in the surface layers of V-doped Mg$_{1-δ}$Ti$_2$O$_4$ through multiple charge transfers and suppression of Jahn-Teller activity
论文作者
论文摘要
尖晶石氧化物家族中的超导性非常罕见，因为它们的良好肌肉构成性质。大约半个世纪前，liti $ _2 $ o $ _4 $成为首次报道的尖晶石化合物，显示出12k过渡温度的超导性。从那时起，进行了几次不成功的尝试来增强这种材料家族的t $ _c $。但是，在V掺杂的毫克$ _ {1-δ} $ _2 $ _2 $ _4 $薄的表面层中，在较高温度（低于16k）的最新实验[ARXIV：2209.02053]报告了超导性，而其散装对应方则保持mott米特的绝缘状态。与其他工程的MGTI $ _2 $ o $ $ _4 $薄膜相比，该材料的超导t $ _c $要高得多。从我们的第一原理分析中，我们已经确定，由于各种离子之间相当大的电荷传递，在V型MGTI $ _2 $ o _4 $的表面上，MG止动物显着降低了Jahn-Teller（JT）活性和防击磁性superexchange。降解的抗磁磁性和降低JT活性的综合作用削弱了系统的障碍，从而导致高温下超导性的出现。
Superconductivity in the family of spinel oxides is very rare owing to their robust Mott-insulating nature. About half a century ago, LiTi$_2$O$_4$ became the first reported spinel compound to show superconductivity with a 12K transition temperature. Since then, several unsuccessful attempts were made to enhance the T$_c$ of this family of materials. However, a very recent experiment [arXiv:2209.02053] has reported superconductivity at a higher temperature (below 16K), in the V-doped Mg$_{1-δ}$Ti$_2$O$_4$ thin surface layer while its bulk counterpart remains Mott insulating. The superconducting T$_c$ of this material is significantly higher compared to other engineered MgTi$_2$O$_4$ thin films grown on different substrates. From our first-principles analysis, we have identified that Mg-depletion significantly reduces Jahn-Teller (JT) activity and antiferromagnetic superexchange at the surface layer of V-doped MgTi$_2$O$_4$ due to considerable charge transfer between various ions. The combined effect of a degraded antiferromagnetic order and reduced JT activity weakens the Mottness of the system, leading to the emergence of superconductivity at higher temperatures.
