Abstract:
: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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Zhang E,Zhi J,Zou YC,Ye Z,Ai L,Shi J,Huang C,Liu S,Lin Z,Zheng X,Kang N,Xu H,Wang W,He L,Zou J,Liu J,Mao Z,Xiu Fdoi
10.1038/s41467-018-07123-ysubject
Has Abstractpub_date
2018-11-07 00:00:00pages
4656issue
1issn
2041-1723pii
10.1038/s41467-018-07123-yjournal_volume
9pub_type
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