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

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

SUBMITTER: Zhang E 

PROVIDER: S-EPMC6220168 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature