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arXiv 1710.04047cond-mat.supr-con
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新化合物ScZrCo1 - $δ$的压致超导性

Pressure Induced Superconductivity in the New Compound ScZrCo1-$δ$

Enyu Wang, Jing Si, Xiyu Zhu, Guan-Yu Chen, Hai Lin, Hai-Hu Wen

摘要:

人们普遍认为关联效应在铜氧化物、铁基和重费米子超导体等非常规超导家族中可能起着重要作用。高压的应用可以调节关联系统中的基态性质,平衡电子的定域性和巡游性,这可能引发非常规的超导性。此外,非中心对称的结构可以诱导自旋三重态配对,这在自然界中是非常罕见的。在这里,我们报告了一个新的化合物ScZrCo 1- $δ$在Ti 2 Ni结构中结晶,空间群FD 3-MS没有空间反转中心。在环境压力下的材料的电阻率显示出不良的金属和弱的半导体行为。此外,比热和磁化率测量产生了相当大的威尔逊比值~4.47。这两个结果都表明了一个具有关联效应的基态。通过施加压力,在环境压力下,电阻率随温度降低而上升的行为被抑制,并逐渐变成金属。在大约19.5GPa的压力下,出现了超导性。在36.05GPa下,观察到了在3.6K左右的超导转变,并具有相当高的上临界场。我们的发现为研究关联效应与超导电性的关系提供了一个新的平台。

英文摘要:

It is widely perceived that the correlation effect may play an important role in several unconventional superconducting families, such as cuprate, iron-based and heavy-fermion superconductors. The application of high pressure can tune the ground state properties and balance the localization and itineracy of electrons in correlated systems, which may trigger unconventional superconductivity. Moreover, non-centrosymmetric structure may induce the spin triplet pairing which is very rare in nature. Here, we report a new compound ScZrCo1-$δ$ crystallizing in the Ti2Ni structure with the space group of FD3-MS without a spatial inversion center. The resistivity of the material at ambient pressure shows a bad metal and weak semiconducting behavior. Furthermore, specific heat and magnetic susceptibility measurements yield a rather large value of Wilson ratio ~4.47. Both suggest a ground state with correlation effect. By applying pressure, the up-going behavior of resistivity in lowering temperature at ambient pressure is suppressed and gradually it becomes metallic. At a pressure of about 19.5 GPa superconductivity emerges. Up to 36.05 GPa, a superconducting transition at about 3.6 K with a quite high upper critical field is observed. Our discovery here provides a new platform for investigating the relationship between correlation effect and superconductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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