Controllable spin-orbit coupling and its influence on the upper critical field in the chemically doped quasi-one-dimensional Nb${}_2$PdS${}_5$ superconductor

Abstract

By systematic chemical substitution of Pt and Ni in the newly-discovered superconductor Nb${}_2$PdS${}_5$ ($T_c\sim$6 K), we study the evolution of its superconducting properties with doping, focussing on the behavior of the upper critical field $H_{c2}$. In contrast to the previous results of Se doping on S sites, superconductivity is found to be rather robust against the Pt and Ni dopants on the one-dimensional Pd chains. Most strikingly, the reduced $H_{c2}$, i.e., the ratio of $H_{c2}/T_c$, is seen to be significantly enhanced by the heavier Pt doping but suppressed in the Ni-doped counterparts, distinct from the nearly constant value in the Se doped samples. Our findings therefore suggest that the upper critical field of this system can be modified in a tunable fashion by chemical doping on the Pd chains with elements of varying mass numbers. The spin-orbit coupling on the Pd sites, by inference, should play an important role in the observed superconductivity and on the large upper critical field beyond the Pauli pair-breaking field.

6 pages, 6 figures

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• Superconductivity in tantalum self-intercalated 4$Ha$-Ta${}_{1.03}$Se${}_2$
• Nodeless superconductivity in quasi-one-dimensional Nb2PdS5: A muSR study
• Enhanced superconductivity in hole-doped Nb${}_2$PdS${}_5$
• Two-dimensional superconductivity in a bulk single-crystal
• Multiband Semimetallic Electronic Structure of Superconducting Ta2PdSe5
• Violation of Kohler rule in Ta2PdTe6 and absence of same in Nb2PdS5- A high field magneto transport study