Quantum Griffiths Singularity in a Layered Superconducting Organic–Inorganic Hybrid Superlattice,ACS Materials Letters

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Quantum Griffiths Singularity in a Layered Superconducting Organic–Inorganic Hybrid Superlattice
ACS Materials Letters ( IF 9.6 ) Pub Date : 2021-01-06 , DOI: 10.1021/acsmaterialslett.0c00523
Yingcheng Zhao _{1,

2} , Yueqi Su _{1,

2} , Yuqiao Guo _{1,

2} , Jing Peng _{1,

2} , Jiyin Zhao _{1,

2} , Chenyang Wang _{1,

2} , Linjun Wang _{1,

2} , Changzheng Wu _{1,

2} , Yi Xie _{1,

2}

Affiliation

Quantum Griffiths singularity (QGS) is among the remarkable phenomena induced by disorder in quantum phase transitions (QPTs). In recent years, experimental progresses have been made in ultrathin superconducting films. However, there is still lack of approaches to trigger QGS in bulk superconductors. Herein, we develop a charge-induced disorder introduction process to trigger QGS in organic-inorganic hybrid superlattices. Large-sized organic cations are intercalated into layered inorganic crystal, which leads to electron doping and thus quasi-two-dimensional superconductivity. The charge transfer between inorganic layers and interlayer cations introduces charge disorder into the hybrid superlattice without destroying lattice integrality. Consequently, QGS emerges in the bulk superconducting superlattice. Furthermore, deviation of phase boundary from the Werthamer–Helfand–Hohenberg theory indicates relatively strong spin-orbit coupling. The observation provides a new pathway to investigate QPTs in disordered systems and reveals universality of QGS in superconductors.

中文翻译：

层状超导有机-无机杂化超晶格中的量子格里菲斯奇点

量子格里菲斯奇点（QGS）是由量子相变（QPTs）的无序引起的显着现象。近年来，超薄超导膜已取得实验进展。但是，仍然缺乏在体超导体中触发QGS的方法。在本文中，我们开发了一种电荷诱导的无序引入过程，以触发有机-无机杂化超晶格中的QGS。大型有机阳离子嵌入层状无机晶体中，这导致电子掺杂，从而导致准二维超导性。无机层和层间阳离子之间的电荷转移将电荷无序引入杂化超晶格，而不会破坏晶格完整性。因此，QGS出现在体超导超晶格中。此外，与Werthamer-Helfand-Hohenberg理论的相界偏差表明，自旋轨道耦合较强。该观察结果为研究无序系统中的QPT提供了新途径，并揭示了QGS在超导体中的普遍性。

更新日期：2021-02-01

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