NMR Study of (Sr,Ba,La)_2Fe_{1+y}Mo_{1-y}O_6 Double Perovskites

• Authors: D. Zając , Cz. Kapusta , P. Riedi , M. Sikora , C. Oates , D. Rybicki , J. De Teresa , D. Serrate , C. Marquina , M. Ibarra
• Languages of publication: EN

Abstracts

EN

The ^{95}Mo and ^{97}Mo NMR spin-echo study of (Sr,Ba,La)_2Fe_{1 +y}Mo_{1-y}O_6 double perovskites is reported. Powder samples of Ba_{1.44}Sr_{0.36}La_{0.2}FeMoO_6 and (Ba_{0.8}Sr_{0.2})_{2-2x}La_x#_x Fe_{1+y}Mo_{1-y}O_6, where# denotes vacancies, for: x=0, y=0; x=0.1, x=0.2 and x=0.3, y=0 and y=0.2 were measured at 4.2 K and no applied magnetic field. NMR signals are observed at 55-100 MHz for the main line and 30-55 MHz for low-frequency satellite. The main line and the satellite are attributed to the ideal and defect positions of Mo atoms. La and vacancy doping introduce more defects, however, increasing the Fe/Mo ratio decreases the amount of defect Mo sites. La doping causes a satellite pattern at the high frequency side of the spectrum, which is related to different numbers of the La next neighbours. The effect is attributed to an increase in the electron density and the corresponding magnetic moment at the adjacent Mo sites and reveals a local character of the electron doping.

Keywords

EN

75.25.+z; 76.60.-k; 78.70.Gq; 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)
• 78.70.Gq: Microwave and radio-frequency interactions
• 75.47.Gk: Colossal magnetoresistance

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 106
• Issue: 5
• Pages: 759-765

Dates

published

2004-11

received

2004-06-06

Contributors

author

D. Zając

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

author

Cz. Kapusta

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

author

P. Riedi

• Department of Physics and Astronomy, University of St. Andrews, St. Andrews, KY16 9SS Scotland, UK

author

M. Sikora

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

author

C. Oates

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

author

D. Rybicki

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

author

J. De Teresa

• Instituto de Ciencia de Materiales de Aragóon, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain

author

D. Serrate

• Instituto de Ciencia de Materiales de Aragóon, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain

author

C. Marquina

• Instituto de Ciencia de Materiales de Aragóon, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain

author

M. Ibarra

• Instituto de Ciencia de Materiales de Aragóon, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain

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Identifiers

DOI

10.12693/APhysPolA.106.759