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

Liu, Shao-Bo1; Tian, Congkuan1,2; Cai, Yongqing3; Cui, Hang1; Wei, Xinjian2; Chen, Mantang1; Zhao, Yang1; Sui, Yuan1; Guan, Shuyue1; Jia, Shuang1; Zhang, Yu2; Feng, Ya2; Li, Jiankun2; Cui, Jian2; Song, Yuanjun2; Hao, Tingting2; Chen, Chaoyu4; Chen, Jian-Hao1,2,5,6

2024-09-01

10.1093/nsr/nwae220

NATIONAL SCIENCE REVIEW   影响因子和分区

2095-5138

2053-714X

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-T-c 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-T-c 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-T-c SCs, thereby substantially expanding the range of applicability of QGS.

quantum phase transition superconductor-metal transition iron-based superconductor quantum Griffiths singularity

SCI

英语

其他

National Key R&D Program of China[2019YFA0308402] ; Innovation Program for Quantum Science and Technology[2021ZD0302403] ; National Natural Science Foundation of China["11934001","92265106","11921005"]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001313246000001

OXFORD UNIV PRESS

Web of Science

1.Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100091, Peoples R China
2.Beijing Acad Quantum Informat Sci, Beijing 100094, Peoples R China
3.Dalian Univ Technol, Sch Phys, Dalian 116024, Peoples R China
4.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Dept Phys, Shenzhen 518055, Peoples R China
5.Peking Univ, Key Lab Phys & Chem Nanodevices, Beijing 100091, Peoples R China
6.Hefei Natl Lab, Hefei 230026, Peoples R China

Liu, Shao-Bo,Tian, Congkuan,Cai, Yongqing,et al. Three-dimensional quantum Griffiths singularity in bulk iron-pnictide superconductors[J]. NATIONAL SCIENCE REVIEW,2024.

Liu, Shao-Bo.,Tian, Congkuan.,Cai, Yongqing.,Cui, Hang.,Wei, Xinjian.,...&Chen, Jian-Hao.(2024).Three-dimensional quantum Griffiths singularity in bulk iron-pnictide superconductors.NATIONAL SCIENCE REVIEW.

Liu, Shao-Bo,et al."Three-dimensional quantum Griffiths singularity in bulk iron-pnictide superconductors".NATIONAL SCIENCE REVIEW (2024).