Phase transitions and oxygen ordering in La2CoO4+δ and (T, T')-La2CuO4 : single crystal growth and structural studies using synchrotron and neutron diffraction methods

For example, in Fig.2 (a) and (b) curves 2 and 3 show the dependence for the samples S1 and S2 respectively, measured directly after the application of pressure

The most significant result of our single crystal X-ray diffraction study is that two well defined anomalies in the temperature dependence of the intensity of fcc forbidden

However the predictions obtained for this ordering do not agree with the structural features of the phases (directions of tilt and unit cell deformation) observed for fatty acid

The transverse acoustic branch Ty[100] thus observed, exhibits no softening over the frequency range 10 GHz v 200 GHz, while a critical increase of the quasi-elastic

At the stability limit of any phase, one of the normal modes has zero frequency and an eigenvector corresponding to the spin deviation of the static instability (soft

ltBis therefore possible, in principle, to separate the individ- ual partial functions if three (or more) independent diffraction measurements can be made in which the

In CeBi neutron experiments in zero [3] and in high magnetic field [4] have shown the existence of three magnetic structures described by stacking sequences of ferromagnetic

The results of figure 2 show that the normal mode may be fairly well defined well above the transition temperature but as the temperature is reduced the