Spin-liquid dynamics of pyrochlore magnets Gd2Ti2O7 and Gd2Sn2O7 - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: The spin-liquid phase of two highly frustrated pyrochlore magnets Gd2Ti2O7and Gd2Sn2O7 is probed using electron spin resonance in the temperature range1.3 - 30 K. The deviation of the absorption line from the paramagnetic position u =\gamma H observed in both compounds below the Curie-Weiss temperature\Theta CW ~ 10 K, suggests an opening up of a gap in the excitation spectra. Oncooling to 1.3 K which is above the ordering transition T N ~ 1.0 K theresonance spectrum is transformed into a wide band of excitations with the gapamounting to \Delta ~ 26 GHz 1.2 K in Gd2Ti2O7 and 18 GHz 0.8 K inGd2Sn2O7. The gaps increase linearly with the external magnetic field. ForGd2Ti2O7 this branch co-exists with an additional nearly paramagnetic lineabsent in Gd2Sn2O7. These low lying excitations with gaps, which are preformedin the spin-liquid state, may be interpreted as collective spin modes split bythe single-ion anisotropy.



Autor: S. S. Sosin, L. A. Prozorova, A. I. Smirnov, P. Bonville, G. Jasmin - Le Bras, O. A. Petrenko

Fuente: https://arxiv.org/







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