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Related Experiment Videos

Goldstone-mode phonon dynamics in the pyrochlore Cd2Re2O7.

C A Kendziora1, I A Sergienko, R Jin

  • 1Naval Research Laboratory, Washington, DC 20375-6365, USA.

Physical Review Letters
|October 4, 2005
PubMed
Summary
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Researchers observed the first Goldstone phonon in a crystalline solid, Cd2Re2O7, linked to a structural phase transition. This collective excitation emerges below 200 K, coinciding with a Raman-active soft mode.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Crystallography

Background:

  • Cd2Re2O7 is the first pyrochlore material discovered to exhibit superconductivity.
  • Structural phase transitions (SPTs) involve changes in crystal symmetry and can influence material properties.
  • Goldstone modes are collective excitations arising from the spontaneous breaking of continuous symmetries.

Purpose of the Study:

  • To investigate the polarized Raman scattering spectra of Cd2Re2O7.
  • To identify and characterize novel excitations associated with the structural phase transition in Cd2Re2O7.
  • To explore the relationship between the structural phase transition and superconductivity in this material.

Main Methods:

  • Polarized Raman scattering spectroscopy was employed.

Related Experiment Videos

  • Measurements were conducted as a function of temperature.
  • The spectra were analyzed to identify symmetry-specific phonon modes.

    • Main Results:

    • A B1 symmetry peak at zero frequency with divergent intensity was observed below the cubic-to-tetragonal SPT at 200 K.
    • This peak is identified as the first observation of a Goldstone phonon in a crystalline solid.
    • The emergence of the Goldstone phonon coincided with a Raman-active soft mode, both originating from an unstable doubly degenerate vibration of O1 atoms.

    Conclusions:

    • The study provides the first experimental evidence of a Goldstone phonon in a crystalline solid, Cd2Re2O7.
    • The Goldstone phonon is directly linked to the structural phase transition and the associated soft mode.
    • Understanding these excitations is crucial for comprehending the interplay between structure, symmetry breaking, and superconductivity in pyrochlores.