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Publications by Year: 1994

1994
Triberis GP, Guskos N, Likodimos V. Small-polaron hopping conductivity in the PrBa2Cu3-xGaxO7-y system. Physica C: Superconductivity and its applications [Internet]. 1994;228:33-41. WebsiteAbstract
Based on experimental observations we propose the small-polaron hopping model to interpret the behavior of the resistivity of PrBa2Cu3-xGaxO7-y system with x = 0.00-0.60 in a wide temperature range (14-290 K), reported by other workers. percolation arguments we evaluate the maximum hopping distances, at high and low temperatures, together with other relevant parameters, and we give a unified and meaningful explanation of the transport mechanism, for different Ga concentrations and the entire temperature range. © 1994.
Guskos N, Likodimos V, Koufoudakis A, Mitros C, Gamari‐Seale H, Wabia M. High‐Tc Superconductor LuBa2Cu3O6 + x. physica status solidi (b) [Internet]. 1994;182:K19-K23. Website
Guskos N, Likodimos V, Palios G, Koufoudakis A, Bojanowski B, Typek J, Wabia M. Low Temperature Critical Fluctuations of the EPR Spectrum of Yb3+ Ions in the Yb0.5Sm0.5Ba2Cu3O6+x Compound in the Tetragonal Phase. physica status solidi (b) [Internet]. 1994;184:K31-K35. Website
Guskos N, Likodimos V, Kuriata J, Metz H, Windsch W, Wabia M, Mitros C, Niarchos D. EPR Spectra of Polycrystalline REBaCuFeO5 (RE = Eu, Y, Yb). physica status solidi (b) [Internet]. 1994;181:K69-K72. Website
Guskos N, Likodimos V, Patapis SK, Kuriata J, Wabia M, Sadlowski L, Koufoudakis A, Mitros C, Gamari‐Seale H, Psycharis V. Low Temperature EPR Spectra of the (Pr, RE)BaCuO Ceramics in the Orthorhombic Phase. physica status solidi (b) [Internet]. 1994;184:445-463. WebsiteAbstract
The EPR spectra of the members of the series Pr0.5RE0.5Ba2Cu3O6+x (RE = Pr, La, Nd, Sm, Eu, Gd, Dy, Ho, Y, Er, Tm, Yb, and Lu) in the orthorhombic phase are investigated at low temperature. The EPR spectra arise from two different paramagnetic centers, one from divalent copper ions in orthorhombic local crystal field symmetry and another from exchange coupled pairs of copper ions whose origin is discussed. The EPR spectra essentially depend on the time exposition. The EPR spectra of some divalent and trivalent rare earth ions are recorded. The crystal field analysis is done for the trivalent ytterbium ions. The semiconducting behaviour of the dc conductivity can be attributed to thermally activated small polaron hopping motion. Copyright © 1994 WILEY‐VCH Verlag GmbH & Co. KGaA