Magnetoresistance anisotropy of a one-dimensional superconducting niobium strip.
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(theta,H) = R(H/Hctheta) where Hctheta =Hc0(cos2theta + gamma(-2)sin2theta)(-1/2) is the angular dependent critical field, gamma is the width to thickness ratio, and Hc0 is the critical field in the thickness direction at theta=0 degrees . The results can be understood in terms of the anisotropic diamagnetic energy for a given field in a one-dimensional superconductor.
Hua
J
J
Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA.
Xiao
Z L
ZL
Imre
A
A
Yu
S H
SH
Patel
U
U
Ocola
L E
LE
Divan
R
R
Koshelev
A
A
Pearson
J
J
Welp
U
U
Kwok
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WK