Evolution of transition metal charge states in correlation with the structural and magnetic properties in disordered double perovskites Ca2−xLaxFeRuO6(0.5 ≤x≤ 2)

Naveen K, Rom T, Islam SS, Reehuis M, Adler P, Felser C, Hoser A, Nath RC, Yadav AK, Jha SN, Bhattacharyya D, Schmidt M, Paul AK (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Physical Chemistry Chemical Physics Royal Society of Chemistry

Book Volume: 23

Pages Range: 21769-21783

Journal Issue: 38

DOI: 10.1039/d1cp02318g

Abstract

A series of disordered Ca1.5La0.5FeRuO6, CaLaFeRuO6and La2FeRuO6double perovskites were prepared by the solid-state reaction method and investigated by neutron powder diffraction, X-ray absorption near-edge structure (XANES) analysis at the Ru-K edge, Mössbauer spectroscopy, DC magnetization and resistivity measurements. All compounds crystallize in the orthorhombic crystal structure with the space groupPbnmdown to 3 K, showing a random distribution of Fe and Ru at the B site. Thermogravimetric analysis indicates oxygen deficiency in the Ca-rich and formal oxygen hyperstoichiometry in the La-rich members of the present series. While Mössbauer spectra verify the Fe3+state for all compositions, the XANES study reveals a variable Run+oxidation state which decreases with increasing La content. The end member actually is a Ru3+/Ru4+compound with possibly some cation vacancies. From magnetic susceptibility and neutron diffraction measurements, the presence of a G-type antiferromagnetic ordering was observed with a drastic increase in transition temperature from 275 K (Ca1.5La0.5FeRuO6) to 570 K (La2FeRuO6). Mössbauer spectroscopy confirms the presence of long-range ordering but, due to local variations in the exchange interactions, the magnetic states are microscopically inhomogeneous. All the samples are variable range hopping semiconductors. A complex interplay between structural features, charge states, anion or cation defects, and atomic disorder determines the magnetic properties of the present disordered 3d/4d double perovskite series.

Involved external institutions

National Institute of Technology Kurukshetra IN India (IN) Indian Institute of Science Education and Research (IISER) Kolkata IN India (IN) Helmholtz-Zentrum Berlin für Materialien und Energie (HZB) DE Germany (DE) Bhabha Atomic Research Center / भाभा परमाणु अनुसन्धान केंद्र (BARC) IN India (IN) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE)

How to cite

APA:

Naveen, K., Rom, T., Islam, S.S., Reehuis, M., Adler, P., Felser, C.,... Paul, A.K. (2021). Evolution of transition metal charge states in correlation with the structural and magnetic properties in disordered double perovskites Ca2−xLaxFeRuO6(0.5 ≤x≤ 2). Physical Chemistry Chemical Physics, 23(38), 21769-21783. https://doi.org/10.1039/d1cp02318g

MLA:

Naveen, Kumari, et al. "Evolution of transition metal charge states in correlation with the structural and magnetic properties in disordered double perovskites Ca2−xLaxFeRuO6(0.5 ≤x≤ 2)." Physical Chemistry Chemical Physics 23.38 (2021): 21769-21783.

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