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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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A Variable Temperature Synchrotron X-ray Diffraction Study of Colossal Magnetoresistant NdMnAsO0.95F0.05.

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|February 16, 2016
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Researchers studied colossal magnetoresistance (CMR) in the NdMnAsO0.95F0.05 oxypnictide. Variable temperature synchrotron X-ray diffraction revealed lattice and magnetic order coupling, crucial for CMR effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • High-temperature superconductivity in iron arsenides has spurred interest in transition metal pnictides.
  • Colossal magnetoresistance (CMR) was recently observed in NdMnAsO1-xFx (x = 0.05-0.08), reaching -95% at 3 K.
  • This CMR is linked to a second-order phase transition from an insulating antiferromagnet to a semiconducting paramagnet.

Purpose of the Study:

  • To investigate the crystal structure of the CMR oxypnictide NdMnAsO0.95F0.05 using variable temperature synchrotron X-ray powder diffraction.
  • To understand the relationship between lattice parameters, magnetic ordering, and the observed colossal magnetoresistance.

Main Methods:

  • Synchrotron X-ray powder diffraction was performed on NdMnAsO0.95F0.05 across a temperature range of 4 K to 290 K.
  • The diffraction data were analyzed to determine the crystal structure and unit cell parameters.
  • Subtle changes in lattice parameters were correlated with magnetic ordering transitions.

Main Results:

  • The tetragonal crystal structure (space group P4/nmm) remained consistent from 4 K to 290 K, with no structural phase transitions observed.
  • Coupling between the lattice and magnetic order was identified.
  • Discontinuities in the temperature dependence of the lattice parameters (a and c/a ratio) were observed at the magnetic ordering temperature (TSR), corresponding to Nd spin ordering and Mn moment reorientation.

Conclusions:

  • The crystal structure of NdMnAsO0.95F0.05 is stable across the studied temperature range, including below the magnetic ordering temperature.
  • Subtle lattice changes associated with magnetic ordering play a significant role in the coupling of electronic and magnetic degrees of freedom.
  • These findings suggest that minute variations in lattice parameters are critical for the observed colossal magnetoresistance mechanism in this material.