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

• Publisher: Institute of Physics, Polish Academy of Sciences
• 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

• 1. C.N.R. Rao, A.K. Raychaudhuri, in: Colossal Magnetoresistance, Charge Ordering and Related Properties of Manganese Oxides, Eds. C.N.R. Rao, B. Raveau, World Scientific, Singapore 1998, p. 1
• 2. C. Zener, Phys. Rev., 82, 403, 1951
• 3. J. Przewoźnik, J. Chmist, L. Kolwicz-Chodak, Z. Tarnawski, A. Kolodziejczyk, K. Krop, K. Kellner, G. Gritzner, Acta Phys. Pol. A, 106, 665, 2004
• 4. S.-W. Choeng, H.Y. Hwang, in: Colossal Magnetoresistive Oxides, Ed. Y. Tokura, Gordon and Breach, London 2000, p. 237
• 5. A. Simopoulos, G. Kallias, E. Devlin, I. Panagiotopoulos, M. Pissas, J. Magn. Magn. Mater., 177-181, 860, 1998
• 6. J. Przewoźnik, J. .Zukrowski, J. Chmist, E. Japa, A. Kolodziejczyk, K. Krop, K. Kellner, G. Gritzner, Nukleonika, 49, S37, 2004
• 7. J. Hesse, A. Rubartch, J. Phys. E, Sci. Instrum., 7, 526, 1974
• 8. G. Le Caer, J.M. Dubois, J. Phys. E, Sci. Instrum., 12, 1083, 1979
• 9. S. Lord, P.C. Riedi, Meas. Sci. Technol., 6, 149, 1999
• 10. M.M. Savosta, P. Novak, Phys. Rev. Lett., 87, 137204, 2001
• 11. J.M.D. Coey, Adv. Phys., 48, 167, 1999
• 12. Cz. Kapusta, P.C. Riedi, W. Kocemba, M.R. Ibarra, J.M.D. Coey, J. Appl. Phys., 87, 7121, 2000
• 13. J. Przewoźnik, Cz. Kapusta, J. Zukrowski, K. Krop, M. Sikora, D. Rybicki, D. Zajac, C.J. Oates, P.C. Riedi, Phys. Status Solidi B, 243, 259, 2006
• 14. J. Przewoźnik, J. Zukrowski, J. Chmist, Z. Tarnawski, A. Kolodziejczyk, K. Krop, K. Kellner, G. Gritzner, Phys. Status Solidi C, 3, 138, 2006

Identifiers

DOI

10.12693/APhysPolA.111.649