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

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外文摘要：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-Tc 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-Tc superconductor CaFe1-xNixAsF(x＜5％)bulk single crystals,where the QGS states persist to up to 5.3 K.A comprehensive quantum phase diagram is established that delineates the 3D anisotropic QGS of SMT induced by perpendicular and parallel magnetic fields.Our findings reveal the universality of QGS in 3D superconducting systems and unconventional high-Tc SCs,thereby substantially expanding the range of applicability of QGS.

外文关键词：

quantum phase transitionsuperconductor-metal transitioniron-based superconductorquantum Griffiths singularity

作者：

Shao-Bo Liu、Congkuan Tian、Yongqing Cai、Hang Cui、Xinjian Wei、Mantang Chen、Yang Zhao、Yuan Sui、Shuyue Guan、Shuang Jia、Yu Zhang、Ya Feng、Jiankun Li、Jian Cui、Yuanjun Song、Tingting Hao、Chaoyu Chen、Jian-Hao Chen

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作者单位：

International Center for Quantum Materials,School of Physics,Peking University,Beijing 100091,China

Beijing Academy of Quantum Information Sciences,Beijing 100094,China

School of Physics,Dalian University of Technology,Dalian 116024,China

Shenzhen Institute for Quantum Science and Engineering and Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China

Key Laboratory for the Physics and Chemistry of Nanodevices,Peking University,Beijing 100091,China

Hefei National Laboratory,Hefei 230026,China

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出版年：

2024

DOI：

10.1093/nsr/nwae220

国家科学评论(英文版)

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ISSN：

年,卷(期)：2024.11(12)