No Access Submitted: 25 July 2008 Accepted: 04 December 2008 Published Online: 29 January 2009
Journal of Applied Physics 105, 023522 (2009);
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  • D. Logvinovich
  • J. Hejtmánek
  • K. Knižek
  • M. Maryško
  • N. Homazava
  • P. Tomeš
  • R. Aguiar
  • S. G. Ebbinghaus
  • A. Reller
  • A. Weidenkaff
Physical properties of perovskite-type SrMoO2N phases were studied in the temperature range of 3K<T<300K. The oxynitride crystallizes in a cubic unit cell (space group Pm3¯m) as revealed by neutron and x-ray diffraction measurements. The polycrystalline material shows weakly temperature dependent electrical resistivity and low glasslike heat conductivity, both reflecting the unusual strength of the scattering processes in the charge carrier transport. Based on the positive Seebeck coefficient values, holes are identified as the dominating charge carriers in SrMoO2N. Down to 150 K, the magnetic susceptibility is temperature independent and explained as enhanced Pauli paramagnetism (χ104emumol1Oe1). The absolute value of its magnetic susceptibility is, however, half of that for SrMoO3. Simultaneously, the lower Sommerfeld coefficient γ measured for the oxynitride confirms the lower density of states near the Fermi level for SrMoO2N compared to SrMoO3. At low temperature, both SrMoO2N and SrMoO3 show Curie paramagnetism superimposed to the temperature independent Pauli paramagnetism and an anomaly at T=54K. This anomaly is attributed to the presence of molecular oxygen in the material, while the Curie upturn is likely associated with a small amount of paramagnetic centers.
The authors acknowledge the German Science Foundation (Grant No. DFG-SPP 1136) for the financial support as well as Dr. Denis Sheptyakov (SINQ) for the technical assistance. This work is partly based on the experiments performed at the Swiss Spallation Neutron Source SINQ, Paul Scherrer Institute, Villingen, Switzerland.
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