Magnetotransport properties of layered quasi-one-dimensional superconductor Ta2PdS5

Ternary Ta2PdS5 is a newly discovered low-dimensional superconductor with typical quasi one-dimensional chain structure, which has attracted a great deal of research attention owing to its intriguing physical properties. Here we report the systematic study of magnetotransport properties of Ta2PdS5 nanowires exfoliated from its bulk material. The superconducting critical field of system shows strong anisotropic behavior and violation of the Pauli limit when the magnetic field is along the b-axis. I-V measurements show a series of multiple voltage steps in transition to normal state and systematic hysteresis between the up and down sweeps, indicating a typical quasi-one dimensional nature in its superconductivity. Surprisingly, the nanowire undergoes a superconductor-metal transition with increasing perpendicular magnetic field. 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.