Abstract
Abstract
In this paper, influence of spin frustration on bulk magnetic property and charge carriers’ conduction on bulk electrical transport property of La2-xCaxFeMnO6 (where x=0, 0.1, 0.2, and 0.5) compounds have been reported comprehensively. The anti-site disorder (ASD) of Fe and/or Mn sites is qualitatively determined by the Reitveld refinement of XRD and magnetic properties. Mixed valence states (+3 and +4) of both Fe and Mn cations have been determined by the comprehensive analysis of XPS, and reveals significant increment in Fe3+ concentrations with increasing Ca2+ doping. The variation in resistivity with increasing temperature shows the semiconducting nature of all samples. The values of the saturation magnetic moment [MS ~1.7 μB/f.u. for pure and ~1.5 μB/f.u. for 25% Ca2+ doped LCFMO 25 sample] suggest that these samples exhibit a strong ferrimagnetic (FiM) ground state at 5 K. Temperature driven magnetization and AC susceptibility measurements reveal existence of multiple spin cluster glassy states along with a Griffiths phase within the materials. The values of the characteristic frequency (~ 105–107 Hz) and spin-flipping time (~10-5–10-7 s) obtained from both the Vogel–Fulcher and power law analysis. These analyses demonstrate that the cluster glass regions exist at lower temperatures. Interestingly, the doping of Ca²⁺ leads to the development of new cluster glass-like features at approximately 14 K and 195 K for 25% doping of Ca2+. These findings may provide useful insight for designing future spintronic materials those exhibit inhomogeneous spin frustration and tunable electronic states.