Spin fluctuations in the magnetically ordered phase of frustrated pyrochlore systems
P.Bonville, I.Mirebeau, J.P.Sanchez
TL;DR
This paper investigates low-temperature spin fluctuations in frustrated pyrochlore systems Gd2Sn2O7 and Tb2Sn2O7 using Mossbauer spectroscopy and specific heat measurements, revealing anomalies linked to correlated spin dynamics.
Contribution
It provides new insights into spin fluctuations in magnetically ordered pyrochlore systems through combined experimental techniques and a two-level fluctuation model.
Findings
Anomalies in hyperfine quantities observed at very low temperatures.
Spin fluctuations are interpreted via a two-level system model.
Evidence of correlated spin dynamics in ordered pyrochlore systems.
Abstract
Two geometrically frustrated pyrochlore stannates, undergoing long range magnetic order below 1K, were investigated at very low temperature. Anomalies in the behaviour of hyperfine quantities are found, by 155Gd Mossbauer spectroscopy in Gd2Sn2O7 and by low temperature specific heat measurements in Tb2Sn2O7. They are interpreted in terms of fluctuations of the correlated Gd or Tb spins, using a model two-level system (the nuclear spins) submitted to a randomly fluctuating (hyperfine) field.
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