2024/03/13 by Manish Kr. Singh, A. K. Bera, Singh, Manish Kr. +7 · 1 citation
Materials Science · #Crystal Structures and Properties #FOS: Physical sciences #Glass properties and applications #Materials Science (cond-mat.mtrl-sci) #Solid-state spectroscopy and crystallography #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.2403.08679
openalex publication_date 2024/03/13 · openalex created_date 2024/03/15 · openalex updated_date 2026/07/28
We investigate crystal structure and magnetic properties including spin relaxation and magnetocaloric effect in NASICON type NaFe2PO4(SO4)2 sample. The Rietveld refinement of x-ray and neutron diffraction patterns show a rhombohedral crystal structure with the R3c space group. The core-level spectra confirm the desired oxidation state of constituent elements. The \it dc--magnetic susceptibility (χ) behavior in zero field-cooled (ZFC) and field-cooled (FC) modes show the ordering temperature ≈50~K. Interestingly, the analysis of temperature dependent neutron diffraction patterns reveal an A-type antiferromagnetic (AFM) structure with the ordered moment of 3.8 μB/Fe3+ at 5~K, and a magnetostriction below T\rm N= 50~K. Further, the peak position in the \it ac--χ is found to be invariant with the excitation frequency supporting the notion of dominating AFM transition. Also, the unsaturated isothermal magnetization curve supports the AFM ordering of the moments; however, the observed coercivity suggests the presence of weak ferromagnetic (FM) correlations at 5~K. On the other hand, a clear bifurcation between ZFC and FC curves of \it dc--χ and the observed decrease in peak height of \it ac--χ with frequency suggest for the complex magnetic interactions. The spin relaxation behavior in thermo-remanent magnetization and aging measurements indicate the glassy states at 5~K. Moreover, the Arrott plots and magnetocaloric analysis reveal the AFM--FM interactions in the sample at lower temperatures.