Observed (open circles) and calculated (solid lines) XRD patterns of (, 0.05, 0.075, and 0.10) at room temperature. Solid line at the bottom of each panel shows the difference between observed and calculated patterns. Vertical lines show the position of Bragg peaks. The values corresponding to intense Bragg peaks are also listed.
The crystal structure of the compounds .
The La concentration dependence of lattice constants and unit cell volume.
The temperature dependent and curves for (, 0.05, 0.075, and 0.10) compounds under 100 Oe applied magnetic field.
(a) The virgin magnetization curves for all four samples at 5 K. The solid curves are the fit to the observed data with Eq. (1). (b) The vs curves over all four quadrants for (, 0.05, 0.075, and 0.10) at 5 K. Inset (i) shows an enlarge view of the vs curves for , 0.075, and 0.1 samples at lower fields, where a clear hysteresis is seen for the and 0.1 samples. Inset (ii) shows the dependency of the coercive field and remanent magnetization on the La concentration at 5 K.
The hysteresis loop for the sample with and 0.075 at 5 K [after subtraction of the linear AFM contribution as per Eq. (1)]. The numbers and the arrows indicate the sequence and the direction of the field sweep.
The temperature dependent electrical resistivity curves for (, 0.05, 0.075, and 0.10). Solid lines are the fitting of the observed data with Eq. (2).
(a) The MR vs applied magnetic field at 150 K for (, 0.05, 0.075, and 0.10). The inset shows the field dependent MR at 300 K for all samples. [(b) and (c)] The dependency of the MR on magnetic field at 300, 200, and 150 K for the samples and 0.1, respectively. The solid lines are fit to the data according to Eq. (8). Insets show the temperature dependence of the exponent for respective samples.
The Rietveld refined unit cell parameters, atomic positions, isotropic thermal parameters, and for the samples with , 0.05, 0.075, and 0.1.
The fitted parameters , , , and derived from the magnetization data.
The parameters as deduced from the electrical transport data.
The fitted and parameters derived from the MR data.
Article metrics loading...
Full text loading...