title: Superconductivity with extremely large upper critical fields in Nb2Pd0.81S5.
abstract: Here, we report the discovery of superconductivity in a new transition metal-chalcogenide compound, i.e. Nb2Pd0.81S5, with a transition temperature Tc is approximately equal to 6.6 K. Despite its relatively low Tc, it displays remarkably high and anisotropic superconducting upper critical fields, e.g. μ0Hc2 (T → 0 K) > 37 T for fields applied along the crystallographic b-axis. For a field applied perpendicularly to the b-axis, μ0Hc2 shows a linear dependence in temperature which coupled to a temperature-dependent anisotropy of the upper critical fields, suggests that Nb2Pd0.81S5 is a multi-band superconductor. This is consistent with band structure calculations which reveal nearly cylindrical and quasi-one-dimensional Fermi surface sheets having hole and electron character, respectively. The static spin susceptibility as calculated through the random phase approximation, reveals strong peaks suggesting proximity to a magnetic state and therefore the possibility of unconventional superconductivity.
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
authors.forename: Q
authors.initials: Q
authors.lastname: Zhang
authors.forename: G
authors.initials: G
authors.lastname: Li
authors.forename: D
authors.initials: D
authors.lastname: Rhodes
authors.forename: A
authors.initials: A
authors.lastname: Kiswandhi
authors.forename: T
authors.initials: T
authors.lastname: Besara
authors.forename: B
authors.initials: B
authors.lastname: Zeng
authors.forename: J
authors.initials: J
authors.lastname: Sun
authors.forename: T
authors.initials: T
authors.lastname: Siegrist
authors.forename: M D
authors.initials: MD
authors.lastname: Johannes
authors.forename: L
authors.initials: L
authors.lastname: Balicas