Growth and Transport Properties of (110)-Oriented La_2/3Sr_1/3MnO₃Thin Films on TiO₂-Buffered Si (100) Substrates

Abstract

AbslneL Inelastic neutron scattering experimenls in KzSeO,, CySeO, and KzCIQ are reported. ?be lowest CI-& phonon branches along the a*-axis in their plmm phase have teen characterized for the three mmpounds. lle mulls are mmpared with recent lattice dynamical simulations using rigid-ion models. Potassium chroma=, that simulations suggested to be incommensurate at low temperatures, evidences no s t~~l~r a l phase transition down to 12 K, but ik lowest Cz phonon branch exhibits a significative softening and decreases more than XI% as the temperature is lowered from MO K to 36 K . ? r e snflening mechanism m this "pound and in polassium selenate is related to an increase of the effective interaction between an amustic and an o p t i d branch.Previous inelastic neutron scattering investigations in A,BX, materials have focused on the temperature behaviour of the soft-mode branch and the characterization of phason and amplitudon branches in the INC phase [2, 16201. Here we report inelastic neutron scattering measurements of the low frequency C,-C, modes (same notation for irreducible representations as in [2]) of K,SeO,, Cs,SeO, and K,CrO, in the Phom phase. The main purpose of the study has

Microstructure and magnetic properties of oxidized titanium nitride thin filmsin situgrown by pulsed laser deposition

“…Titanium dioxide (TiO 2 ) thin films have been studied and used extensively [1][2][3][4][5][6] since they possess remarkable optical, electronic, chemical and mechanical properties such as excellent optical transmittance (>85%) in the visible and near infrared wavelength ranges, high index of refraction (n ≈ 2.35 at 550 nm), large dielectric constant (ε r ≈ 105 at 4.2 K) and low loss tangent (tan δ ≈ 10 −7 at 4.2 K) [7,8], high chemical stability and mechanical durability. The widespread applications of TiO 2 films include (a) anti-reflecting and protective coating on optical elements; (b) capacitors or gates in microelectronic devices; (c) photocatalyst and catalytic devices; (d) optical waveguide in integrated optics and (e) suitable template layers for growing high-T c superconducting YBa 2 Cu 3 O 7 (YBCO) films, CrO 2 and LaSrMnO 3 films for microwave, biepitaxial junctions and spintronics applications [9][10][11].…”