Effect of doping on irreversible Campbell length in MgB$_2$ single crystals (2008)
Martin, C., Vannette, M. D., Gordon, R. T., Prozorov, R., Karpinski, J., Zhigadlo, N. D.
We have measured small-amplitude rf penetration depth $\lambda(H,T)$ in pure and C, Li and (Li+C) doped single crystals of MgB$_2$. The effect of doping on the critical temperature T$_c$ and on the...
Martin, C., Gordon, R. T., Tanatar, M. A., Vannette, M. D., Tillman, M. E., Mun, E. D., ...
In- and out-of- plane magnetic penetration depth was studied in single crystals of NdFeAsO$_{0.9}$F$_{0.1}$. The low temperature behavior of the in-plane London penetration depth, $\lambda_{ab} (T)$,...
Current-driven transformations of the intermediate state patterns in type-I superconductors (2008)
Dynamic structure of the intermediate state was studied in pinning-free thick Pb strips using real-time magneto-optical visualization. It is found that topological hysteresis can be lifted by...
Field-dependent AC susceptibility of itinerant ferromagnets (2008)
Whereas dc measurements of magnetic susceptibility, $\chi$, fail to distinguish between local and weak itinerant ferromagnets, radio-frequency (rf) measurements of $\chi$ in the ferromagnetic state...
Prozorov, R., Vannette, M. D., Law, S. A., Bud'ko, S. L., Canfield, P. C.
Tunnel-diode resonator technique was used to study crystals of ferromagnetic re-entrant superconductor, ErRh$_{4}$B$_{4}$. At the boundary between ferromagnetism (FM) and superconductivity (SC),...
Dynamic Formation of Metastable Intermediate State Patterns in Type-I Superconductors (2008)
Structure of the intermediate state in type-I superconducting lead (Pb) is shown to be very sensitive to the ramp rate of an applied magnetic field. The configurations of resulting static patterns...
Effect of high-intensity ultrasound on superconducting properties of polycrystalline YBCO (2008)
Prozorov, T., McCarty, B., Prozorov, R.
High intensity ultrasonic irradiation (sonication) of alkane slurries of polycrystalline \ybco leads to a significant modification of the grain morphology and, if performed with enforced oxygen flow,...
Fermi surface and strong coupling superconductivity in single crystal NdFeAsO_{1-x}F_x (2008)
Liu, C., Kondo, T., Tillman, M. E., Gordon, R., Samolyuk, G. D., Lee, Y., ...
We use angle-resolved photoemission spectroscopy (ARPES) to investigate the electronic properties of the newly discovered oxypnictide superconductor, NdFeAsO_{1-x}F_x. We find a well-defined Fermi...
Prozorov, R., Tillman, M. E., Mun, E. D., Canfield, P. C.
Magneto-optical imaging was used to study the local magnetization in polycrystalline NdFeAsO$_{0.9}$F$_{0.1}$ (NFAOF). Individual crystallites up to $\sim200\times100\times30$ $\mu m^{3}$ in size...
^{7}Li NMR Study of Heavy Fermion LiV2O4 Containing Magnetic Defects (2008)
Zong, X., Das, S., Borsa, F., Vannette, M. D., Prozorov, R., Schmalian, J., ...
We present a systematic study of the variations of the ^{7}Li NMR properties versus magnetic defect concentration up to 0.83 mol% within the spinel structure of polycrystalline powder samples and a...
Exotic (anti)ferromagnetism in single crystals of Pr6Ni2Si3 (2008)
Janssen, Y., Dennis, K. W., Prozorov, R., Canfield, P. C., McCallum, R. W.
The ternary intermetallic compound Pr6Ni2Si3, is a member of a structure series of compounds based on a triangular structure where the number of Pr atoms in the prism cross section can be...
Gordon, R., Vannette, M. D., Martin, C., Nakajima, Y., Tamegai, T., Prozorov, R.
Single crystal of Lu$_2$Fe$_3$Si$_5$ was studied with the tunnel-diode resonator technique in Meissner and mixed states. Temperature dependence of the superfluid density provides strong evidence for...
Superfluid density in gapless superconductor CeCoIn5 (2007)
Kogan, V. G., Prozorov, R., Petrovic, C.
Temperature dependence of the London penetration depth $\lambda$ measured in single crystals of CeCoIn$_5$ is interpreted as caused by a strong pair-breaking scattering that makes the...
s-Wave superconductivity in non-centrosymmetric Re_3W probed by magnetic penetration depth (2007)
Zuev, Y. L., Kuznetsova, V. A., Prozorov, R., Vannette, M. D., Lobanov, M. V., Christen, D. K., ...
We report measurements of the temperature dependence of the magnetic penetration depth \lambda(T) in non-centrosymmetric superconductor Re_3W. We employed two experimental techniques: extraction of...
Vannette, M. D., Safa-Sefat, A., Jia, S., Law, S. A., Lapertot, G., Bud'ko, S. L., ...
Dynamic magnetic susceptibility, $\chi$, was studied in several intermetallic materials exhibiting ferromagnetic, antiferromagnetic and metamagnetic transitions. Precise measurements by using a 14...
Radio-frequency magnetic response of vortex lattices undergoing structural transformations (2007)
Prozorov, R., Kogan, V. G., Vannette, M D., Bud'ko, S. L., Canfield, P. C.
We report a clear anomaly in the rf response of a tunnel-diode resonator measured in borocarbide crystals in dc fields along the $c-$axis. We associate the anomaly in the dynamic magnetic...
Superconducting and normal state properties of the layered boride OsB2 (2006)
Singh, Yogesh, Niazi, A., Vannette, M. D., Prozorov, R., Johnston, D. C.
OsB_2 crystallizes in an orthorhombic structure (Pmmn) which contains alternate boron and osmium layers stacked along the c-axis. The boron layers consist of puckered hexagons as opposed to the flat...
Kogan, V. G., Prozorov, R., Bud'ko, S. L., Canfield, P. C., Thompson, J. R., Karpinski, J., ...
The field dependence of the vortex core size $\xi(B)$ is incorporated in the London model, in order to describe reversible magnetization $M(B,T)$ for a number of materials with large Ginzburg-Landau...
Penetration depth study of superconducting gap structure of 2\textit{H}-NbSe$_2$ (2006)
Fletcher, J. D., Carrington, A., Diener, P., Rodiere, P., Brison, J. P., Prozorov, R., ...
We report measurements of the temperature dependence of both in-plane and out-of-plane penetration depths ($\lambda_a$ and $\lambda_c$ respectively) in 2\textit{H}-NbSe$_2$. Measurements were made...
Super-hard Superconductivity (2004)
Young, D. P., Modovan, M., Prozorov, R., Adams, P. W.
We present a study of the magnetic response of Type-II superconductivity in the extreme pinning limit, where screening currents within an order of magnitude of the Ginzburg-Landau depairing critical...
Prozorov, R., Lawrie, D. D., Hetel, I., Fournier, P., Giannetta, R. W.
The magnetic penetration depth of single crystal $\rm{Sm_{1.85}Ce_{0.15}CuO_{4-y}}$ was measured down to 0.4 K in dc fields up to 7 kOe. For insulating $\rm{Sm_2CuO_4}$, Sm$^{3+}$ spins order at the...
Snezhko, A., Prozorov, R., Lawrie, D. D., Giannetta, R. W., Gauthier, J., Renaud, J., ...
The London penetration depth, lambda{ab}(T), is reported for thin films of the electron-doped superconductor Pr{2-x}Ce{x}CuO{4-y} at three doping levels (x = 0.13, 0.15 and 0.17). Measurements down...
Prozorov, R., Snezhko, A., He, T., Cava, R. J.
The London penetration depth, $\lambda(T)$, was measured in polycrystalline powders of the non-oxide perovskite superconductor $\mathrm{MgCNi_3}$ by using a sensitive tunnel-diode resonator...
Campbell Penetration Depth of a Superconductor in the Critical State (2002)
Prozorov, R., Giannetta, R. W., Kameda, N., Tamegai, T., Schlueter, J. A., Fournier, P.
The magnetic penetration depth $\lambda(T,H,j)$ was measured in the presence of a slowly relaxing supercurrent, $j$. In single crystal $\mathrm{Bi_2Sr_2CaCu_2O_8}$ below approximately 25 K,...
Energy gap and proximity effect in $MgB_2$ superconducting wires (2001)
Prozorov, R., Giannetta, R. W., Bud'ko, S. L., Canfield, P. C.
Measurements of the penetration depth $\lambda (T,H)$ in the presence of a DC magnetic field were performed in $MgB_2$ wires. In as-prepared wires $\lambda (T,H
Fluctuations in $YBa_{2}Cu_{3}O_{6.5}$ single crystal: an evidence for 2D->3D crossover (2000)
Rosenstein, B., Shapiro, B. Ya., Prozorov, R., Shaulov, A., Yeshurun, Y.
Magnetization measurements as a function of temperature are reported for $YBa_{2}Cu_{3}O_{6.5}$ crystal (T_{c}=45.2 K) for fields between 0.2 to $3.5\ Tesla$. All isochamps for H>1 Tesla intersect at...
Carrington, A., Manzano, F., Prozorov, R., Giannetta, R. W., Kameda, N., Tamegai, T.
Tunneling and theoretical studies have suggested that Andreev bound states form at certain surfaces of unconventional superconductors. Through studies of the temperature and field dependence of the...
Prozorov, R., Giannetta, R. W., Schlueter, J., Kini, A. M., Mohtasham, J., Winter, R. W., ...
The temperature dependence of the in-plane, \lambda_{\parallel}, and interplane, \lambda_{\perp}, London penetration depth was measured in the metal-free all-organic superconductor \beta-ET (see...
Prozorov, R., Giannetta, R. W., Carrington, A., Fournier, P., Greene, R. L., Hinks, D. G., ...
A method is presented to measure the absolute value of the London penetration depth, $\lambda$, from the frequency shift of a resonator. The technique involves coating a high-$T_c$ superconductor...
Nonequilibrium Campbell length: probing the vortex pinning potential (2000)
Prozorov, R., Giannetta, R. W., Tamegai, T., Guptasarma, P., Hinks, D. G.
The $AC$ magnetic penetration depth $\lambda (T,H,j)$ was measured in presence of a macroscopic $DC$ (Bean) supercurrent, $j$. In single crystal BSCCO below approximately 28 K, $\lambda (T,H,j)$...
Low temperature vortex phase diagram of Bi2Sr2CaCu2O8 : a magnetic penetration depth study (2000)
Prozorov, R., Giannetta, R. W., Tamegai, T., Guptasarma, P., Hinks, D. G.
We report measurements of the magnetic penetration depth \lambda_m(T) in the presence of a DC magnetic field in optimally doped BSCCO-2212 single crystals. Warming, after magnetic field is applied to...
Prozorov, R., Giannetta, R. W., Carrington, A., Araujo-Moreira, F. M.
The distribution of magnetic induction in Meissner state with finite London penetration depth is analyzed for platelet samples of rectangular cross-section in a perpendicular magnetic field. The...
Prozorov, R., Giannetta, R. W., Fournier, P., Greene, R. L.
The in-plane magnetic penetration depth, $\lambda (T)$, was measured down to 0.4 K in single crystals of electron-doped superconductors, Pr$_{1.85}$Ce$_{0.15}$CuO$_{4-\delta}$ (PCCO) and...
Magnetic penetration depth in electron-doped cuprates - evidence for gap nodes (1999)
Prozorov, R., Giannetta, R. W., Fournier, P., Greene, R. L.
The in-plane penetration depth \lambda(T) is measured in electron-doped single crystals Nd1.85Ce0.15CuO4-x (NCCO) and Pr1.85Ce0.15CuO4-x (PCCO) using a 11 MHz LC resonator. In NCCO, \lambda(T)...
Low Temperature Penetration depth of \kappa-(ET)_2Cu[N(CN)_2]Br and \kappa-(ET)_2Cu(NCS)_2 (1999)
Carrington, A., Bonalde, I. J., Prozorov, R., Giannetta, R. W., Kini, A. M., Schlueter, J., ...
We present high precision measurements of the penetration depth \lambda of single crystals of \kappa-(ET)_2Cu[N(CN)2]Br and \kappa-(ET)_2Cu(NCS)_2 at temperature down to 0.4 K. We find that, at low...
Self-organization of vortices in type-II superconductors during magnetic relaxation (1999)
We revise the applicability of the theory of self-organized criticality (SOC) to the process of magnetic relaxation in type-II superconductors. The driving parameter of self-organization of vortices...
Magnetic irreversibility and relaxation in assembly of ferromagnetic nanoparticles (1998)
Prozorov, R., Yeshurun, Y., Prozorov, T., Gedanken, A.
Measurements of the magnetic irreversibility line and time-logarithmic decay of the magnetization are described for three $Fe_{2}O_{3}$ samples composed of regular amorphous, acicular amorphous and...
Prozorov, R., Sonin, E. B., Sheriff, E., Shaulov, A., Yeshurun, Y.
We calculate the distribution of the current density $j$ in superconducting films along the direction of an external field applied perpendicular to the film plane. Our analysis reveals that in the...
Collective flux creep: beyond the logarithmic solution (1998)
Burlachkov, L., Giller, D., Prozorov, R.
Numerical studies of the flux creep in superconductors show that the distribution of the magnetic field at any stage of the creep process can be well described by the condition of spatial constancy...
Prozorov, R., Konczykowski, M., Schmidt, B., Yeshurun, Y., Shaulov, A., Villard, C., ...
We report on measurements of the angular dependence of the irreversibility temperature $T_{irr}(\theta) $ in $YBa_2Cu_3O_{7-\delta }$ thin films, defined by the onset of a third harmonic signal and...
Plastic vortex-creep in YBa$_2$Cu$_3$O$_{7-x}$ crystals (1996)
Abulafia, Y., Shaulov, A., Wolfus, Y., Prozorov, R., Burlachkov, L., Yeshurun, Y., ...
Local magnetic relaxation measurements in YBa$_2$Cu$_3$O$_{7-x}$ crystals show evidence for plastic vortex-creep associated with the motion of dislocations in the vortex lattice. This creep mechanism...
Irreversible magnetization in thin YBCO films rotated in external magnetic field (1996)
Prozorov, R., Poddar, A., Sheriff, E., Shaulov, A., Yeshurun, Y.
The magnetization M of a thin YBaCuO film is measured as a function of the angle $\theta $ between the applied field H and the c-axis. For fields above the first critical field, but below the Bean's...
R. Prozorov, E. B. Sonin, E. Sheri, A. Shaulov
We calculate the current density distribution in superconducting films along the direction of an external field applied perpendicular to the film plane. Our analysis reveals that the current...