Magnetic Phase Separation in Double Perovskite Sr2TiMnO5.87

• Published in: Applied magnetic resonance 2023-05, Vol.54 (4-5), p.561-580
• Main Authors: Popov, D. V., Yatsyk, I. V., Batulin, R. G., Cherosov, M. A., Vakhitov, I. R., Faizrakhmanov, I. A., Yusupov, R. V., Chupakhina, T. I., Deeva, Yu. A., Fazlizhanov, I. I., Maiti, T., Eremina, R. M.
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Atoms and Molecules in Strong Fields; Crystal structure; Debye temperature; Dielectric properties; Diffraction; Heat; Laser Matter Interaction; Line spectra; Magnetic measurement; Magnetic properties; Manganese dioxide; Nitrates; Organic Chemistry; Original Paper; Perovskites; Phase separation; Phase transitions; Physical Chemistry; Physics; Physics and Astronomy; Rietveld method; Scanning electron microscopy; Solid State Physics; Specific heat; Spectroscopy/Spectrometry; Titanium; Unit cell; X ray powder diffraction
• ISSN: 0937-9347; 1613-7507
• DOI: 10.1007/s00723-023-01541-y

The double perovskite Sr 2 TiMnO 5.87 was synthesized via the solution combustion precursor method using Sr(NO 3 ) 2 , MnO 2 , i-Ti(OC 3 H 7 ) 4 , and disubstituted ammonium citrate as a complexing agent. The crystal structure and unit cell parameters are refined by the Rietveld method using powder X-ray diffraction. The magnetic properties of double perovskites Sr 2 TiMnO 5.87 were studied using the ESR spectroscopy, specific heat measurements in the temperature range ~ 5–300 K, and magnetometry under cooling in zero- (ZFC) and nonzero-fields (FC). The four ESR line were observed in ESR spectra, three ESR lines with g ~ 2 and fourth ESR at B res  = 50 mT in both X-and Q-bands measurements in the temperature range 37.5–42 K in Sr 2 TiMnO 5.87 . The peaks obtained in real and imaginary parts of AC magnetization measurements confirm phase separation at the same temperatures. The antiferromagnetic ordering was found out below the temperature T N ≈ 12 K. The fitting Debye and Einstein temperatures, obtained from the specific heat measurements, are equal to θ D  = 217 K, θ E1  = 275 K, θ E2  = 615 K, and θ E3  = 2000 K.