The samples of Bi1.9Sr1.6La0.4CuOy with different oxygen concentrations are obtained by annealing the sintered sample in different conditions. The analysis of lattice parameters shows that the removal of oxygen from the system results in an orthorhombic-tetragonal transition. The analysis of the electron diffraction patterns revealed that the incommensurate modulation structure is independent of the oxygen content, which is in disagreement with the extra oxygen model. In the resistivity measurement, an anomalous deviation of resistivity downward from T-linearity at 180 K is detected, and a corresponding anomaly in thermoelectric power (TEP) is also found, which suggests that a spin gap exists in the Bi-2201 system. The comparison of microstructural characteristics for different samples demonstrates that the structural factor has crucial influence on the spin excitation spectrum.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering