Journal
ACS MATERIALS LETTERS
Volume 3, Issue 2, Pages 210-216Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmaterialslett.0c00523
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Funding
- National Natural Science Foundation of China [21925110, 21890750, 21890751, 21890754, 91745113, U2032161, 11621063]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB36000000]
- National Basic Research Program of China [2017YFA0206702, 2017YFA0206703, 2017YFA0303500]
- Youth Innovation Promotion Association of CAS [2018500]
- USTC Research Funds of the Double First-Class Initiative [YD2060002004]
- Fundamental Research Funds for the Central Universities [WK2060190084]
- Anhui Provincial Natural Science Foundation [1808085MB26]
- USTC Center for Micro and Nanoscale Research and Fabrication
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In this study, Quantum Griffiths singularity (QGS) was triggered in organic-inorganic hybrid superlattices through the introduction of large-sized organic cations into layered inorganic crystals. The charge transfer introduced charge disorder into the hybrid superlattice without destroying lattice integrity, resulting in the emergence of QGS in bulk superconductors. The deviation of the phase boundary from the Werthamer-Helfand-Hohenberg theory suggests relatively strong spin-orbit coupling and provides a new pathway to investigate quantum phase transitions in disordered systems.
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.
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