Three-dimensional nodal superconducting gap in single crystals Ba(Fe$_{1-x}$Ni$_x$)$_2$As$_2$ (2009)
Martin, C., Kim, H., Gordon, R. T., Ni, N., Kogan, V. G., Bud'ko, S. L., ...
The London penetration depth, $\lambda$, is directly related to the density, $n_{s}$, of the Cooper pairs ($\lambda^{2}\propto 1/n_{s}$) and its variation with temperature provides valuable insight...
Pair-breaking in iron-pnictides (2009)
The puzzling features of the slopes of the upper critical field at the critical temperature $T_c$, $H^\prime_{c2}(T_c)\propto T_c$, and of the specific heat jump $\Delta C\propto T_c^3$ of...
Response to Comment by A. Bussmann-Holder (arXiv:0909.3603) (2009)
Kogan, V. G., Martin, C., Prozorov, R.
Response to Comment by A. Bussmann-Holder (arXiv:0909.3603)
Narrow Josephson junctions in thin films (2009)
Maayan Moshe, V G Kogan, R G Mints
Abstract. We consider the edge-type Josephson junctions in thin films, for which the stray fields significantly affect the screening and tunneling currents. It is demonstrated that the spatial...
Kogan, V. G., Martin, C., Prozorov, R.
The two gaps in a two-band clean s-wave superconductor are evaluated self-consistently within the quasiclassical Eilenberger weak-coupling formalism with two in-band and one inter-band pairing...
Non-exponential London penetration depth in RFeAsO$_{0.9}$F$_{0.1}$ (R=La,Nd) single crystals (2009)
Martin, C., Tillman, M. E., Kim, H., Tanatar, M. A., Kim, S. K., Kreyssig, A., ...
The superconducting penetration depth, $\lambda(T)$, has been measured in RFeAsO$_{0.9}$F$_{0.1}$ (R=La,Nd) single crystals (R-1111). In Nd-1111, we find an upturn in $\lambda(T)$ upon cooling and...
Anisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2 (2008)
Tanatar, M. A., Ni, N., Martin, C., Gordon, R. T., Kim, H., Kogan, V. G., ...
Anisotropies of electrical resistivity, upper critical field, London penetration depth and critical currents have been measured in single crystals of the optimally doped iron pnictide superconductor...
Gapud, A. A., Moraes, S., Khadka, R. P., Canfield, P. C., Kogan, V. G., Reyes, A. P., ...
High, DC current densities are used to drive flux quanta via the Lorentz force, towards a highly ordered free flux flow (FFF) dynamic state in the weak-pinning environment provided by high-quality...
Martin, C., Gordon, R. T., Tanatar, M. A., Vannette, M. D., Tillman, M. E., Mun, E. D., ...
This paper is no longer active and will NOT appear in print. For new data and analysis, please see: arXiv:0903.2220