Single phase TiO 2 thin films, of either rutile or anatase structure, have been prepared on SrTiO 3 ͑STO͒͑100͒ substrates by in situ pulsed laser deposition ͑PLD͒. Thermodynamically unfavorable, for films deposited on STO͑100͒ substrate directly, pure anatase TiO 2 ͑00l͒ films were formed even when a rutile TiO 2 ͑110͒ substrate was used as a target. On the other hand, pure rutile TiO 2 ͑110͒ films were obtained by oxidizing PLD TiN films in-situ at temperatures higher than 700°C. The optimized deposition conditions for preparing TiN and TiO 2 films were reported. The crystalline structure, surface morphology, and electronic structure of these films were examined. A mechanism of the process of film formation is also proposed.

Electric and magnetic properties of La0.67Sr0.33MnO3 thin films with a metal-insulator crossover behavior Influence of structural disorder on magnetic and transport properties of ( La 0.7 Sr 0.3 ) 0.5 ( Pr 0.65 Ca 0.35 ) 0.5 MnO 3 films Low Temp.

No abstract

By the spatial-temporal-resolved femtosecond spectroscopy on well-textured ͑110͒and ͑100͒-YBCO thin films, two distinctly temperature-dependent characteristics of quasiparticle relaxation in the nodal and antinodal directions are clearly identified. One temperature dependence associated with a high-energy gap has been observed along the ab diagonal for the whole hole-doping region and along the b axis except near optimal doping, while the other temperature dependence related to the opening of the superconducting gap appears along b axis regardless of the hole concentration. This spatial dichotomy between the nodal and antinodal quasiparticle dynamics and the evolution of gap symmetry with hole doping are discussed for enlightenment on the nature of the phase diagram of hole-doped cuprates. These strongly suggest that the two characteristics may have different physical origins and compete with each other.

No abstract