Temperature dependence of the EPR spectra of GdBa2Cu3O7-δ compounds in orthorhombic and tetragonal phases
Creators
- 1. Section of Solid State, Dept. of Physics, Univ. of Athens (Greece)
- 2. Inst. of Material Science, National Research Center Democritos, Athens (Greece)
Description
EPR measurements are presented for two samples of GdBa2Cu3O7-δ of which one is superconducting (orthorhombic phase) and one is nonsuperconducting (tetragonal phase). For the superconducting sample signal associated with Cu2+ and Gd3+ ions are detected above and below Tc (with gGd=1.999(2)). The sample with oxygen deficiency gives an EPR signal with a strong temperature dependence up to 30K coming from Gd3+ ions in GdBa2Cu3O7-δ, with g = 2.063(3). These characteristics can be ascribed to the semiconducting properties of the tetragonal phase of GdBa2Cu3O7-δ. Below T = 30K, the sample with tetragonal structure gives an additional EPR line associated with Cu2+ -Cu3+ ion pairs. The intensity of the EPR signal strongly depends on the temperature. (orig.)
Additional details
Additional titles
- Augmented title (English)
- Gd-Ba-Cu-O
Publishing Information
- Journal Title
- Physica Status Solidi B
- Journal Volume
- 162
- Journal Issue
- 1
- Series
- Phys. Status Solidi B.
- Journal Page Range
- 243-249
- ISSN
- 0370-1972
- CODEN
- PSSBB
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 22033726
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- BARIUM OXIDES; COPPER IONS; COPPER OXIDES; ELECTRON SPIN RESONANCE; GADOLINIUM IONS; GADOLINIUM OXIDES; HIGH-TC SUPERCONDUCTORS; LATTICE PARAMETERS; MAGNETIZATION; ORTHORHOMBIC LATTICES; QUANTITY RATIO; QUATERNARY COMPOUNDS; TEMPERATURE DEPENDENCE; TETRAGONAL LATTICES; TRANSITION TEMPERATURE; ULTRALOW TEMPERATURE; VERY LOW TEMPERATURE
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; AMINES; ATOMIC IONS; BARIUM COMPOUNDS; CHALCOGENIDES; CHARGED PARTICLES; COPPER COMPOUNDS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; GADOLINIUM COMPOUNDS; IONS; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MAGNETIC RESONANCE; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; RESONANCE; SUPERCONDUCTORS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS