Τίτλος:
Magnetic properties of a new vanadate Cu13Fe4V10O44
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
A new double vanadate, Cu13Fe4V10O44, obtained by standard solid-state reaction method, has been studied by magnetic susceptibility and electron paramagnetic resonance (EPR) techniques. Measurements of dc susceptibility in ZFC and FC modes in 2-300 K temperature range as well as magnetization in magnetic fields up to 70 kOe have revealed complex magnetic behavior and transition to the antiferromagnetic phase below 2.7 K. The value of the effective magnetic moment calculated from static magnetization measurements was significantly smaller than expected from nominal valences of iron and copper ions indicating strong antiferromagnetic correlations and interactions in clusters or chains of magnetic ions even at high temperature. Although the paramagnetic phase covers a broad temperature range (3-300 K) it differs in many aspects at low and high temperatures. Temperature dependence of EPR parameters (g-factor, linewidth, integrated intensity) obtained by fitting the experimental spectrum with Lorentzian lineshape point to the presence of antiferromagnetic dimers in the high-temperature range, strong antiferromagnetic correlations in the paramagnetic phase and critical slowing down of the spin fluctuations on approaching Neel temperature as well as the appearance of magnetically isolated iron ions in the antiferromagnetic phase. © 2015 Published by Elsevier B.V.
Συγγραφείς:
Typek, J.
Zolnierkiewicz, G.
Bobrowska, M.
Guskos, N.
Blonska-Tabero, A.
Περιοδικό:
Journal of Magnetism and Magnetic Materials
Λέξεις-κλειδιά:
Antiferromagnetism; Electron resonance; Ions; Iron compounds; Magnetic moments; Magnetic properties; Magnetic resonance; Magnetic susceptibility; Magnetism; Magnetization; Mesoporous materials; Metal ions; Paramagnetic resonance; Paramagnetism; Polycrystalline materials; Solid state reactions; Spin fluctuations; Temperature distribution; Transition metal compounds, Antiferromagnetic correlations; Antiferromagnetic phase; Antiferromagnets; Broad temperature ranges; Effective magnetic moments; Electron paramagnetic resonances (EPR); Standard solid state reaction method; Vanadates, Electron spin resonance spectroscopy
DOI:
10.1016/j.jmmm.2015.01.042
