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Related Experiment Videos

"Devil's staircase"-type phase transition in NaV2O5 under high pressure.

K Ohwada1, Y Fujii, N Takesue

  • 1Neutron Scattering Laboratory, Institute for Solid States Physics, The University of Tokyo, 106-1 Shirakata, Tokai, 319-1106, Japan.

Physical Review Letters
|August 11, 2001
PubMed
Summary

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Researchers discovered a "devil's staircase" phase transition in NaV2O5 crystals under low temperature and high pressure. This transition involves complex superstructures and is explained by a theoretical model, suggesting coupled atomic and charge ordering.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Crystallography

Background:

  • The sodium vanadate (NaV2O5) compound exhibits complex magnetic and electronic properties.
  • Spin-ladder materials are of interest due to their potential for novel quantum phenomena.
  • Understanding phase transitions is crucial for materials design and application.

Purpose of the Study:

  • To investigate the
  • devil's staircase
  • -type phase transition in NaV2O5.
  • To characterize the superstructures formed during these transitions.
  • To elucidate the relationship between temperature, pressure, and structural modulations.

Main Methods:

  • Synchrotron radiation x-ray diffraction was employed to probe the crystal structure.

Related Experiment Videos

  • High pressure and low temperature conditions were applied.
  • Analysis of modulation wave vectors (q(c)) was performed.

    • Main Results:

    • A series of successive phase transitions were observed, forming higher-order commensurate phases.
    • Superstructures of the 2a x 2b x zc type were identified.
    • The temperature and pressure dependence of q(c) was accurately reproduced by the axial next nearest neighbor Ising model.

    Conclusions:

    • The
    • devil's staircase
    • phase transition in NaV2O5 is confirmed and characterized.
    • The observed modulations are likely linked to atomic displacements and charge ordering.
    • The axial next nearest neighbor Ising model provides a valid theoretical framework for this system.