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V.R. Galakhov,D.I. Turkin,V.V. Mesilov,S.N. Shamin,G.V. Bazuev,K. Kuepper 한국물리학회 2018 Current Applied Physics Vol.18 No.2
We present X-ray diffraction patterns, soft Ca, Co, and Fe absorption spectra, magnetic susceptibility, and temperature dependent magnetization measurements in order to characterize ABaM4O7 solid solutions A = Y, Ca; M = Co, Fe). Cobalt ions are in 2 + and high-spin 3 + oxidation states. In the iron-doped solid solutions, Fe ions were found to be trivalent. Doping with Fe ions leads to a decreasing amount of Co3+ ions. Magnetic properties of the studied samples showed a spin-glass behavior. Negative values of the Curie–Weiss temperatures indicated the predominance of antiferromagnetic exchange interactions. The freezing point of the magnetic moments is 51 K and does not vary with the amount of Fe doping.
X-ray absorption spectroscopy and magnetic studies of Sr1xCexMn1yCoyO3d solid solutions
S.N. Shamin,V.V. Mesilov,M.S. Udintseva,A.V. Korolev,T.I. Chupakhina,G.V. Bazuev,V.R. Galakhov 한국물리학회 2016 Current Applied Physics Vol.16 No.12
We present results of measurements of temperature dependence of the magnetic susceptibility and soft X-absorption spectra of double-substitution solid solutions Sr1xCexMn1yCoyO3d. It was found that in the solid solution Sr0.8Ce0.2Co0.2Mn0.8O2.96, cobalt and cerium ions are in the Co2þ and Ce4þ valence states, respectively. About 90% of manganese ions in Sr0.8Ce0.2Co0.2Mn0.8O2.96 are in the 4þ state, and the rest of them are in the 3þ state. In the solid solution Sr0.9Ce0.1Co0.4Mn0.6O2.85, manganese and cerium ions are in the 4þ states. About 75% of cobalt ions are in the high-spin Co3þ state and 25% of cobalt ions are in the 2þ state. Doping Mn position with Co ions reduces the antiferromagnetic interaction in the initial compounds, which leads to a decrease of the Neel temperature and to the magnetic transition of the material into the spin-glass state.