Michiel Sprik
Journal of Physics Condensed Matter
We have used resistivity and Hall measurements on ion-irradiated thin films of the cuprate superconductor Nd2-xCexCuO4-δ (NCCO) to explore the full range of transport behavior as a function of disorder in this material from superconductivity to variable-range-hopping (VRH) conduction. The cotangent of the Hall angle (cot ΘH) in lightly irradiated samples exhibited a temperature dependence related to that of resistivity, providing support for a recent theory of Varma and Abrahams. The most highly irradiated samples exhibited p(T)∝exp[(To/T)0.5] at low temperatures, evidence of VRH in the presence of a Coulomb gap. The change of the Hall number with disorder and temperature is analyzed in the framework of possible two-carrier conduction in NCCO.
Michiel Sprik
Journal of Physics Condensed Matter
U. Wieser, U. Kunze, et al.
Physica E: Low-Dimensional Systems and Nanostructures
Dipanjan Gope, Albert E. Ruehli, et al.
IEEE T-MTT
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989