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5 papers · 1 filter
The metal-insulator transition in amorphous Si_{1-x}Ni_x: Evidence for Mott's minimum metallic conductivity
A. Mobius, C. Frenzel, R. Thielsch +10
We study the metal-insulator transition in two sets of amorphous Si_{1-x}Ni_x films. The sets were prepared by different, electron-beam-evaporation-based technologies: evaporation…
Hall-effect in LuNi_2B_2C in normal and superconducting mixed states
V. N. Narozhnyi, J. Freudenberger, V. N. Kochetkov +3
The Hall resistivity rho_{xy} of LuNi_2B_2C is negative in the normal as well as in the mixed state and has no sign reversal typical for high-T_c superconductors. A distinct nonlin…
Anomalous magnetic ordering in PrBa_2Cu_3O_{7-y} single crystals: Evidence for magnetic coupling between the Cu and Pr sublattices
V. N. Narozhnyi, D. Eckert, K. A. Nenkov +3
In Al-free PrBa_2Cu_3O_{7-y} single crystals the kink in the temperature dependence of magnetic susceptibility chi_{ab}(T), connected with Pr antiferromagnetic ordering, disappears…
Comment on ``Superconducting PrBa_2Cu_3O_x''
V. N. Narozhnyi, S. -L. Drechsler
Recently, Zou et al. (Phys. Rev. Lett. 80, 1074, 1998) reported the observation of bulk superconductivity (SC) for a PrBa_2Cu_3O_x (Pr123) single crystal grown by the traveling-sol…
Manifestation of spin-charge separation in the dynamic dielectric response of one--dimensional Sr2CuO3
R. Neudert, M. Knupfer, M. S. Golden +6
We have determined the dynamical dielectric response of a one-dimensional, correlated insulator by carrying out electron energy-loss spectroscopy on Sr2CuO3 single crystals. The ob…