NMR (^{55}Mn, ^{139}La) and Mössbauer Spectroscopy (^{119}Sn) Studies of (La_{0.67}Ca_{0.33})(Mn_{1-x}Sn_x)O_{3-δ} Compounds

• Authors: J. Przewoźnik
• Languages of publication: EN

Abstracts

EN

A ^{119}Sn Mössbauer spectroscopy and zero field ^{55}Mn and ^{139}La NMR studies of (La_{0.67}Ca_{0.33})(Mn_{1-x}Sn_x)O_{3-δ} (x=0, 0.01, 0.03, andδ≈0.06) were reported. The temperature evolution of the Sn hyperfine field (B_{hf}) for x=0.03 determined from the Mössbauer spectroscopy measurements was analysed within a molecular field model. A fit to the temperature dependence of B_{hf}^{max} provided the Curie temperature T^*_C=160(3) K, which is in good agreement with T_C obtained from dc magnetisation measurements. The ^{55}Mn NMR spectra for $x=0$ and 0.01 show a single double exchange Mn^{3+/4+} resonance line and exhibit strong Suhl-Nakamura relaxation effects characteristic of the ferromagnetic metallic phase. The spectra for x=0.03 show a coexistence of the double exchange line with the lines characteristic of Mn^{3+} and Mn^{4+} valence states. This shows that a 3% Sn doping strongly suppresses the double exchange interaction and leads to microscopic phase segregation into ferromagnetic metal and ferromagnetic insulator.

Keywords

EN

76.60.-k; 76.80.+y; 75.47.Lx; 77.80.Bh; 75.47.Gk

Discipline

• 76.60.-k: Nuclear magnetic resonance and relaxation(see also 33.25.+k Nuclear resonance and relaxation in atomic and molecular physics and 82.56.-b Nuclear magnetic resonance in physical chemistry and chemical physics; for structure determination using magnetic resonance techniques, see 61.05.Qr; for biophysical applications, see 87.80.Lg; for NMR in superconducting materials, see 74.25.nj)
• 76.80.+y: Mössbauer effect; other γ-ray spectroscopy(see also 33.45.+x Mössbauer spectra—in atomic and molecular physics; for biophysical applications, see 87.64.kx; for chemical analysis applications, see 82.80.Ej)
• 75.47.Gk: Colossal magnetoresistance
• 75.47.Lx: Magnetic oxides

• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 111
• Issue: 5
• Pages: 649-659

Dates

published

2007-05

Contributors

author

J. Przewoźnik

• Department of Solid State Physics, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.111.649