Magnetic excitations in dipolar pyrochlore antiferromagnet Gd$_2$Sn$_2$O$_7$

Details Magnetic excitations in dipolar pyrochlore antiferromagnet Gd$_2$Sn$_2$O$_7$ Magnetic excitations in dipolar pyrochlore antiferromagnet Gd$_2$Sn$_2$O$_7$

2008-09-04

arxiv.org/abs/0809.0798v1

Phys. Rev. B 79, 014419 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 5 figures

Scientific paper

The spin dynamics in the geometrically frustrated pyrochlore antiferromagnet $\rm Gd_2Sn_2O_7$ is studied by means of the electron spin resonance. In the ordered phase ($T_N = 1$ K), we have detected three gapped resonance modes. Their values agree well with the developed spin-wave theory which takes into account the Heisenberg nearest-neighbor exchange, the single-ion anisotropy and the long-range dipolar interactions. The theory also predicts a fourth lowest-frequency gap, which lies beyond the experimental range of frequencies, but determines the exponential decrease of the specific heat at low temperature.

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