Article

# Absence of long-range magnetic ordering in the pyrochlore compound Er2Sn2O7.

Department of Chemistry, University of Winnipeg, Winnipeg, MB, R3B 2E9, Canada.

Journal of Physics Condensed Matter (Impact Factor: 2.22). 09/2011; 23(38):382201. DOI: 10.1088/0953-8984/23/38/382201 Source: PubMed

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**ABSTRACT:**Spin dynamics in Er2Ti2O7 and Er2Sn2O7 have been probed by means of muon-spin relaxation (mu+SR) in the temperature range 0.02 \leq T \leq 300 K. Both compounds are thought to constitute experimental realizations of the highly frustrated XY antiferromagnet on the pyrochlore lattice, for which theory predicts fluctuation-induced magnetic order. Our results for Er2Ti2O7 are consistent with a transition into an ordered state at T_{\mathrm {N}} \sim 1.1 K, in agreement with previous neutron measurements. Below this temperature, the muon relaxation rate lambda(T) remains large ({\sim }2 MHz) and temperature independent, in contrast to the behaviour in conventional magnets. The thermal evolution of lambda(T) for Er2Sn2O7 is somewhat similar to that of the Ti material. However, the depolarization curves remain exponential over the entire temperature range, suggesting a dense distribution of rapidly fluctuating magnetic moments, and, thus, are compatible with the absence of long-range order at least for T>0.02 K.Journal of Physics Condensed Matter 01/2005; · 2.22 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Er2Ti2O7 has been proposed as a realization of the XY \langle 111\rangle pyrochlore antiferromagnet with dipolar interactions, where the spins of Er3+ lie perpendicular to the \langle 111\rangle local axes. Below a Néel temperature of TN = 1.173 K magnetic order with the propagation vector \vec {k}=(000) occurs. Previous powder neutron diffraction studies were not able to determine details of the magnetic ordering beyond its symmetry due to powder averaging. In an attempt to resolve the questions as regards the ordering in this model magnet we performed a spherical neutron polarimetry experiment using CRYOPAD. The analysis of these data and a proposed magnetic order are presented.Journal of Physics Condensed Matter 01/2007; 19. · 2.22 Impact Factor -
##### Article: Dynamic spin ice: Pr2Sn2O7.

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**ABSTRACT:**In this Letter, we report a new spin ice--Pr2Sn2O7--which appears to have enhanced residual entropy due to the dynamic nature of the spins. Neutron scattering experiments show that at 200 mK, there is a significant amount of magnetic diffuse scattering which can be fit to the dipolar spin-ice model. However, these short-ranged ordered spins have a quasielastic response that is atypical of the canonical spin ices, and suggests that the ground state is dynamic (i.e., composed of locally ordered two-in-two-out spin configurations that can tunnel between energetically equivalent orientations). We report this as an example of a dynamic spin ice down to 200 mK.Physical Review Letters 12/2008; 101(22):227204. · 7.73 Impact Factor

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