Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7

Details Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7 Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7

2005-03-31

arxiv.org/abs/cond-mat/0503756v2

Phys. Rev. Lett. 95, 125503 (2005)

Physics

Condensed Matter

Materials Science

4+ pages, 4 figures. Updated figures and text. Accepted to PRL

Scientific paper

10.1103/PhysRevLett.95.125503

We have measured the polarized Raman scattering spectra of Cd2Re2O7, the first superconducting pyrochlore, as a function of temperature. For temperatures below the cubic-to-tetragonal structural phase transition (SPT) at 200K, a peak with B1 symmetry develops at zero frequency with divergent intensity. We identify this peak as the first observation of the Goldstone phonon in a crystalline solid. The Goldstone phonon is a collective excitation that exists due to the breaking of the continuous symmetry with the SPT. Its emergence coincides with that of a Raman-active soft mode. The order parameter for both features derives from an unstable doubly-degenerate vibration (with Eu symmetry) of the O1 atoms which drives the SPT.

Affiliated with

Also associated with

No associations

Rating

Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-720929