Magnetoresistance Anisotropy of a One-Dimensional Superconducting Niobium Strip

J. Hua; Z. L. Xiao; A. Imre; S. H. Yu; U. Patel; L. E. Ocola; R. Divan; A. Koshelev; J. Pearson; U. Welp; W. K. Kwok

doi:10.1103/PhysRevLett.101.077003

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Magnetoresistance Anisotropy of a One-Dimensional Superconducting Niobium Strip

J. Hua, Z. L. Xiao, A. Imre, S. H. Yu, U. Patel, L. E. Ocola, R. Divan, A. Koshelev, J. Pearson, U. Welp, W. K. Kwok

DOI 10.1103/PhysRevLett.101.077003 · Physical Review Letters

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Abstract

We investigated confinement effects on the resistive anisotropy of a superconducting niobium strip with a rectangular cross section. When its transverse dimensions are comparable to the superconducting coherence length, the angle dependent magnetoresistances at a fixed temperature can be scaled as R(θ,H)=R(H/Hcθ) where Hcθ=Hc0(cos2θ+γ−2sin2θ)−1/2 is the angular dependent critical field, γ is the width to thickness ratio, and Hc0 is the critical field in the thickness direction at θ=0°. The results can be understood in terms of the anisotropic diamagnetic energy for a given field in a one-dimensional superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.038	Pressure not reported	midpoint
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.641	Pressure not reported	midpoint
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.85	Pressure not reported	midpoint