Synthesis and Characterization of Sodium Iron Antimonate Na2FeSbO5 One-Dimensional Antiferromagnetic Chain Compound with a Spin Glass Ground State
| Autor: | Alexey V. Sobolev, G. V. Raganyan, T. M. Vasilchikova, Myung-Hwan Whangbo, Alexander N. Vasiliev, Igor A. Presniakov, I. S. Glazkova, Sergey V. Streltsov, Sitharaman Uma, Elena A. Zvereva, Aanchal Sethi, Hyun-Joo Koo |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Condensed Matter - Materials Science
Spin glass 010405 organic chemistry Sodium Oxide Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences chemistry.chemical_element 010402 general chemistry 01 natural sciences 0104 chemical sciences Characterization (materials science) Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Chain (algebraic topology) Antiferromagnetism Physical and Theoretical Chemistry Ground state Antimonate |
| Zdroj: | Inorg. Chem. Inorganic Chemistry |
| Popis: | A new oxide, sodium-iron antimonate, Na2FeSbO5, was synthesized and structurally characterized, and its static and dynamic magnetic properties were comprehensively studied both experimentally by dc and ac magnetic susceptibility, magnetization, specific heat, electron spin resonance (ESR) and Mössbauer measurements, and theoretically by density functional calculations. The resulting single-crystal structure (a = 15.6991(9) Å b = 5.3323 (4) Å c = 10.8875(6) Å S.G. Pbna) consists of edge-shared SbO6 octahedral chains, which alternate with vertex-linked, magnetically active FeO4 tetrahedral chains. The 57Fe Mössbauer spectra confirmed the presence of high-spin Fe3+ (3d5) ions in a distorted tetrahedral oxygen coordination. The magnetic susceptibility and specific heat data show the absence of a long-range magnetic ordering in Na2FeSbO5 down to 2 K, but ac magnetic susceptibility unambigously demonstrates spin-glass-type behavior with a unique two-step freezing at Tf1 ≈ 80 K and Tf2 ≈ 35 K. Magnetic hyperfine splitting of 57Fe Mössbauer spectra was observed below T∗ ≈ 104 K (Tf1 < T*). The spectra just below T∗ (Tf1 < T < T*) exhibit a relaxation behavior caused by critical spin fluctuations, indicating the existence of short-range correlations. The stochastic model of ionic spin relaxation was used to account for the shape of the Mössbauer spectra below the freezing temperature. A complex slow dynamics is further supported by ESR data revealing two different absorption modes presumably related to ordered and disordered segments of spin chains. The data imply a spin-cluster ground state for Na2FeSbO5. © 2019 American Chemical Society. |
| Databáze: | OpenAIRE |
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