Spin Dynamics of the Magnetoresistive Pyrochlore Tl_2Mn_2O_7

Details Spin Dynamics of the Magnetoresistive Pyrochlore Tl_2Mn_2O_7 Spin Dynamics of the Magnetoresistive Pyrochlore Tl_2Mn_2O_7

1998-05-11

arxiv.org/abs/cond-mat/9805131v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages (RevTex), 4 figures (encapsulated postscript), to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.80.4582

Neutron scattering has been used to study the magnetic order and spin dynamics of the colossal magnetoresistive pyrochlore Tl_2Mn_2O_7. On cooling from the paramagnetic state, magnetic correlations develop and appear to diverge at T_C (123 K). In the ferromagnetic phase well defined spin waves are observed, with a gapless ($\Delta <0.04$ meV) dispersion relation E=Dq^{2} as expected for an ideal isotropic ferromagnet. As T approaches T_C from low T, the spin waves renormalize, but no significant central diffusive component to the fluctuation spectrum is observed in stark contrast to the La$_{1-x}$(Ca,Ba,Sr)$_x$MnO$_3$ system. These results argue strongly that the mechanism responsible for the magnetoresistive effect has a different origin in these two classes of materials.

Affiliated with

Also associated with

No associations

Rating

Spin Dynamics of the Magnetoresistive Pyrochlore Tl_2Mn_2O_7 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 Spin Dynamics of the Magnetoresistive Pyrochlore Tl_2Mn_2O_7, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin Dynamics of the Magnetoresistive Pyrochlore Tl_2Mn_2O_7 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-719202