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

Abstract

The spin dynamics in the geometrically frustrated pyrochlore antiferromagnet $\mathrm{G}{\mathrm{d}}_2\mathrm{S}{\mathrm{n}}_2{\mathrm{O}}_7$ 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.

8 pages, 5 figures

References in corpus (11)

• Exact low-temperature behavior of kagome antiferromagnet at high fields
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• Magnetic density of states at low energy in geometrically frustrated systems
• Quantum spin fluctuations in the dipolar Heisenberg-like rare earth pyrochlores
• Evidence for gapped spin-wave excitations in the frustrated Gd2Sn2O7 pyrochlore antiferromagnet from low-temperature specific heat measurements
• Transition and spin dynamics at very low temperature in the pyrochlores Yb2Ti2O7 and Gd2Sn2O7
• Soft modes in the easy plane pyrochlore antiferromagnet
• Low temperature specific heat and possible gap to magnetic excitations in the Heisenberg pyrochlore antiferromagnet Gd2Sn207
• ESR study of the single-ion anisotropy in the pyrochlore antiferromagnet Gd2Sn2O7
• Spin-liquid dynamics of pyrochlore magnets Gd2Ti2O7 and Gd2Sn2O7
• Magnetic resonance in a pyrochlore antiferromagnet Gd2Ti2O7

Cited by in corpus (7)

• Magnetic excitations in the XY-pyrochlore antiferromagnet Er${}_2$Ti${}_2$O${}_7$
• Long range order in the dipolar XY antiferromagnet Er${}_2$Sn${}_2$O${}_7$
• Gd pyrochlore under a staggered molecular field in Gd${}_2$Ir${}_2$O${}_7$
• Calculation of the Expected Zero Field Muon Relaxation Rate in the Geometrically Frustrated Rare Earth Pyrochlore Gd2Sn2O7 Antiferromagnet
• Spin Correlations in the Dipolar Pyrochlore Antiferromagnet Gd2Sn2O7
• Numeric calculation of antiferromagnetic resonance frequencies for the noncollinear antiferromagnet
• Splitting of antiferromagnetic resonance modes in the quasi-two-dimensional collinear antiferromagnet Cu(en)(H${}_2$O)${}_2$SO${}_4$