Signature of quantum Griffiths singularity state in a layered quasi-one-dimensional superconductor

Zhang, Enze; Zhi, Jinhua; Zou, Yi-Chao; Ye, Zefang; Ai, Linfeng; Shi, Jiacheng; Huang, Ce; Liu, Shanshan; Lin, Zehao; Zheng, Xinyuan; Kang, Ning; Xu, Hongqi; Wang, Wei; He, Liang; Zou, Jin; Liu, Jinyu; Mao, Zhiqiang; Xiu, Faxian

doi:10.1038/s41467-018-07123-y

Title: Signature of quantum Griffiths singularity state in a layered quasi-one-dimensional superconductor

Journal Article · 06 November 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-07123-y · OSTI ID:1612106

Zhang, Enze ^[1]; Zhi, Jinhua ^[2]; Zou, Yi-Chao ^[3]; Ye, Zefang ^[4]; Ai, Linfeng ^[4]; Shi, Jiacheng ^[4]; Huang, Ce ^[4]; Liu, Shanshan ^[4]; Lin, Zehao ^[4]; Zheng, Xinyuan ^[4]; Kang, Ning ^[2]; Xu, Hongqi ^[2]; Wang, Wei ^[5]; He, Liang ^[5];

^[3]; Liu, Jinyu ^[6]; Mao, Zhiqiang ^[6]; Xiu, Faxian ^[7]

Fudan Univ., Shanghai (China); DOE/OSTI
Peking Univ., Beijing (China)
Univ. of Queensland, Brisbane, QLD (Australia)
Fudan Univ., Shanghai (China)
Nanjing Univ. (China
Tulane Univ., New Orleans, LA (United States)
Nanjing Univ. (China); Fudan Univ., Shanghai (China)

Quantum Griffiths singularity was theoretically proposed to interpret the phenomenon of divergent dynamical exponent in quantum phase transitions. It has been discovered experimentally in three-dimensional (3D) magnetic metal systems and two-dimensional (2D) superconductors. But, whether this state exists in lower dimensional systems remains elusive. Here, we report the signature of quantum Griffiths singularity state in quasi-one-dimensional (1D) Ta2PdS5 nanowires. The superconducting critical field shows a strong anisotropic behavior and a violation of the Pauli limit in a parallel magnetic field configuration. Current-voltage measurements exhibit hysteresis loops and a series of multiple voltage steps in transition to the normal state, indicating a quasi-1D nature of the superconductivity. Surprisingly, the nanowire undergoes a superconductor-metal transition when the magnetic field increases. Upon approaching the zero-temperature quantum critical point, the system uncovers the signature of the quantum Griffiths singularity state arising from enhanced quenched disorders, where the dynamical critical exponent becomes diverging rather than being constant.

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Research Organization:: Tulane Univ., New Orleans, LA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0014208

OSTI ID:: 1612106

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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