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10 results on '"J. Lukatela"'

1. Thermoelectric power of Bi2Sr2CaCu2O8 single crystals with varying oxygen stoichiometry

Author

J. Lukatela, B. Keszei, and L. Forrò

Subjects
chemistry.chemical_classification, High-temperature superconductivity, Condensed matter physics, Chemistry, Fermi level, Astrophysics::Cosmology and Extragalactic Astrophysics, General Chemistry, Condensed Matter Physics, law.invention, Condensed Matter::Materials Science, symbols.namesake, law, Condensed Matter::Superconductivity, Seebeck coefficient, Materials Chemistry, Density of states, symbols, Charge carrier, Inorganic compound, Single crystal, thermoelectric power, high T_c superconductor, single crystal, Stoichiometry, Nuclear chemistry
Abstract

We report on the in - plane (Sab) and the out - of - plane (Sc) thermoelectric power of Bi2Sr2CaCu2O8 single crystals below 300 K. The Sab has been measured as a function of the oxygen stoichiometry. Our interpretation of the results is based on a model in which there is a narrow peak in the density of states of the charge carriers near the Fermi level.

Published
1990
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3. Isotope effect on the Peierls transition temperature of TTF-TCNQ

Author

J. Lukatela, Marko Miljak, E. Aharon-Shalom, L. Giral, Jean-Marc Fabre, and J.R. Cooper

Subjects
Phase transition, Crystallography, Condensed matter physics, Peierls transition, Chemistry, Kinetic isotope effect, Materials Chemistry, isotope effect, peierls transition, TTF-TCNQ, electrical conductivity, General Chemistry, Conductivity, Condensed Matter Physics
Abstract

Conductivity measurements on isotopically substituted single crystals of TTF-TCNQ show a relatively large shift in the phase transition temperatures at 52.5 K (T1) and 37.7 K (T3). Deuteration of both TTF and TCNQ chains increases T1 by 0.75 ± 0.15 K, N15 substitution increases T1 by 0.6±0.1 K while deuteration of the TTF chains apparently has no significant effect. Different possible interpretations of these results are briefly discussed.

Published
1978
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