Three-dimensional quantum Griffiths singularity in bulk iron-pnictide superconductors

The quantum Griffiths singularity (QGS) is a phenomenon driven by quenched disorders that break conventional scaling invariance and result in a divergent dynamic critical exponent during quantum phase transitions (QPT). While this phenomenon has been well-documented in low-dimensional conventional s...

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Published in:National science review 2024-12, Vol.11 (12), p.nwae220
Main Authors: Liu, Shao-Bo, Tian, Congkuan, Cai, Yongqing, Cui, Hang, Wei, Xinjian, Chen, Mantang, Zhao, Yang, Sui, Yuan, Guan, Shuyue, Jia, Shuang, Zhang, Yu, Feng, Ya, Li, Jiankun, Cui, Jian, Song, Yuanjun, Hao, Tingting, Chen, Chaoyu, Chen, Jian-Hao
Format: Article
Language:English
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Summary:The quantum Griffiths singularity (QGS) is a phenomenon driven by quenched disorders that break conventional scaling invariance and result in a divergent dynamic critical exponent during quantum phase transitions (QPT). While this phenomenon has been well-documented in low-dimensional conventional superconductors and in three-dimensional (3D) magnetic metal systems, its presence in 3D superconducting systems and in unconventional high-temperature superconductors (high- SCs) remains unclear. In this study, we report the observation of robust QGS in the superconductor-metal transition (SMT) of both quasi-2D and 3D anisotropic unconventional high- superconductor CaFe Ni AsF (  
ISSN:2095-5138
2053-714X
2053-714X
DOI:10.1093/nsr/nwae220